Ignore the `helpmojo` goal to save needing an additional Eclipse plugin.

Mirrors of archive.apache.org only mirror the latest release of each
project so, as new releases are made, builds using older versions will
break as the mirrors are updated.

This commit updates the Tomcat deployment test to use the main Apache
archive site. This should provide long-term access to Tomcat binaries,
improving build stability and ensuring that tagged builds are
repeatable.

Backport of 5f087e64

Closes gh-4095

See gh-4098

See gh-4098

Previously, MetricsFilter would treat async requests the same as
sync requests and would record their response status as soon as the
request had been processed by the filter chain. This would result in a
200 response being recorded and the actual response status produced by
the async processing being ignored. Furthermore, the time that was
recorded for the request would not include the time take for any async processing.

This commit updates MetricsFilter to check whether or not an async
request has been started before it records the metrics for the request.
In the event of an async request having been started no metrics are
recorded. Instead, the StopWatch is stored in a request attribute that
is then retrieved during the filtering of the request’s async
dispatch(es). Once the async processing has completed (isAsyncStarted()
returns false), the StopWatch is stopped, removed from the request’s
attributes and the metrics for the request are recorded.

Closes gh-4098

Closes gh-4089

Update all TemplateAvailabilityProvider implementations to use the
relaxed property binder. Also fix FreeMarkerTemplateAvailabilityProvider
to use `template-loader-path` rather than `path`.

Fixes gh-4085

Previously `spring.velocity.charset` only controlled the output encoding
with the templates being loaded with the default encoding. We now
consistently set the same value for both the input and output encodings.

It is still possible to override it to a different value using
`spring.velocity.properties.input.encoding`

Closes gh-3994

Update RelaxedDataBinder so that both `.` and `_` are considered in
getPropertyValuesForNamePrefix(...).

With Spring Boot 1.2.5 binding environment variables of the form
`FOO_BAR_BAZ` to `@ConfigurationProperties(prefix="foo-bar")` objects
worked thanks to a happy accident. When `PropertySourcesPropertyValues`
processed a non enumerable `PropertySource` it called the resolver
with a property name `FOO_BAR.BAZ`. A `SystemEnvironmentPropertySource`
will replace `.` with `_` and hence find a value.

Commit 1abd0879 updated non enumerable processing such that the resolver
was never called.

Replicating the problem is quite involved as you need to ensure that you
have both a SystemEnvironmentPropertySource and a non-enumerable
property source (e.g. RandomPropertySource). A test has been added to
PropertiesConfigurationFactoryTests which passes on 1.2.5, fails on
1.2.6 and passes again following this commit.

Fixes gh-4045

Closes gh-3913

Update SpringBootServletInitializer with a registerErrorPageFilter flag
that can be used to disable ErrorPageFilter registration.

Fixes gh-3603

Update ErrorPageFilter to only handle errors when `response.sendError`
has been called. This should allow custom @ExceptionHandlers to
completely handle errors and return custom status codes without
triggering the "Cannot forward to error page" log message.

The Javadoc for sendError states:

  "The server defaults to creating the response to look like an
   HTML-formatted server error page containing the specified message"

Where as setStatus states

  "This method is used to set the return status code when there is
   no error "

Fixes gh-2745

Update `spring-boot-sample-tomcat-jsp` to include endpoints that trigger
exceptions. Primarily to aid testing of the ErrorPageFilter.

See gh-2745

Update PropertySourcesPropertyValues so that collection values are only
added from a single PropertySource. Prior to this commit, given the
following:

    PropertySource-A
     list[0]=x

    PropertySource-B
     list[0]=y
     list[1]=z

PropertySourcesPropertyValues would take `x` from A and `z` from B,
resulting in a binding of `[x,z]`. The updated code now returns the
more logical `[x]`.

Fixes gh-2611

This reverts commit e04fb155.

Formatting only changed lines doesn't appear to work well.

Using the $home directory seems to be causing intermittent failures on
the CI box.

See gh-3861

* pr/3605:
  Catch more general Hibernate 4.2 LinkageError

Update HibernateJpaAutoConfiguration to catch LinkageError rather than
NoClassDefFoundError. Required due to the fact that JBoss EAP 6 wraps
NoClassDefFoundErrors.

Fixes gh-3605

Update ServerProperties so that unknown SERVER_* environment properties
do not cause startup failures.

Fixes gh-3903

* gh-3926:
  Propagates logback log levels to java.util.logging

Adds the LevelChangePropagator logback listener in order to propagate
Logback's log level changes to java.util.logging loggers.

Logback documentation :
http://logback.qos.ch/manual/configuration.html#LevelChangePropagator

Fixes gh-3924
Closes gh-3926

Update Eclipse cleanup actions to only format changed lines. This will
hopefully help to prevent so many false diffs caused by differences
between Eclipse Luna and Eclipse Mars.

- Update whitespace after inline generics
- Use a more sensible import order
- Update Javadoc warning settings

Update SpringApplicationContextLoader so that setRegisterShutdownHook
is false for tests.

Fixes gh-3763

See gh-3856

Closes gh-3869

Closes gh-3779

Closes gh-3868

Closes gh-3846

Refine commit 8a964814 to set the web environment to false if spring web
is not available in the classpath. Thanks to @mjustin for spotting that
mistake.

Closes gh-3856

Previously, deployment tests were storing the container archives in the
default location (that is `/tmp`) for a total weight of 160MB. In case
the temp directory is cleaned on CI, these have to be downloaded again.

We're now configuring cargo to store these archives in the home directory
instead. This should improve the speed and the stability of the
deployment tests

Closes gh-3861

SpringApplication wrongly expects spring-web to be on the classpath to
figure out whether or not the web environment should be enabled for a
custom context class.

We now properly guard this check so that the web environment is not
enabled (read: not checked) if `spring-web` is not available.

Closes gh-3856