Add auto-configuration and starters for Elasticsearch.

Fixes gh-408

Update all relevant starter POMs to include a `spring-core` dependency
with an exclusion on `commons-logging`. This prevents `commons-logging`
and `jcl-over-slf4j` from both being on the classpath.

Also add enforcer rules to ensure that commons-logging doesn't sneak
back in, and that there is no dependency convergence. (some additional
libraries were required in spring-boot-dependencies)

Tested with a sample maven project as well as using the `spring jar`
command.

Fixes gh-985

Hopefully preventing any accidental commits.

Closes #1002

Provide auto-configuration support for HornetQ JMS broker, along with
an additional starter POM.

The connection factory connects to a broker available on the local
machine by default. A configuration switch allows to enable an embedded
mode that starts HornetQ as part of the application.

In such a mode, the spring.hornetq.embedded.* properties provide
additional options to configure the embedded broker. In particular,
message persistence and data directory locations can be specified. It is
also possible to define the queue(s) and topic(s) to create on startup.

Fixes: gh-765

Fixes #1003

Refactor Jasper initialization code to call JasperInitializer during
server start.

Fixes gh-962
See gh-919

Update JarURLConnection to return correct values from `getURL()`,
`getJarFileURL()` and `getEntryName()`.

Fixes gh-973

Unify the versions used in integration tests launched by the
maven-invoker-plugin. Allows for already cached local copies to be
used, hopefully speeding up the build.

Since the RelaxedBinder now supports it.

Update RelaxedConversionService to support enums that are themselves
declared as lower-case (or mixed case) items.

Fixes gh-996

This commit fixes the main resources directory location so that it also
works in a multi-projects setup.

Fixes gh-993
(cherry picked from commit a69f518c)

This commit fixes the main resources directory location so that it also
works in a multi-projects setup.

Fixes gh-993

Update RelaxedDataBinder to hook in an additional
RelaxedConversionService which can deal with case insensitive enum
mappings.

The RelaxedConversionService could be extended in the future with
additional converters if necessary.

Fixes gh-996

We currently honour type, but ignore ext. Aether doesn't make a
distinction between the two so a Grab that specifies both type and ext
but with different values is considered to be an error.

Fixes #995

Older versions of Spring Social will not have the SocialConfigurerAdapter
so making social autoconfig conditional on that class makes sense (since it
all extends from it).

Fixes gh-986

Looks like a hang over from some older code.

Setting security.basic.enabled=false in a secure
app doesn't make a lot of sense. The sample has it
set to true now (the default) so users can login
(via the form that is sitting in front of the
basic auth filter chain).

Fixes gh-997

It was ignoring the engine argument in the 3 arg version
of template().

If you bind to Map<String,Object> you get a nested Map instead
of period-separated keys. This change just makes JpaProperties
expose a Map<String,String> so the keys are sane.

Fixes gh-988

Closes #994

Fixes gh-979

Only imports classes with names that are not already
imported into teh SourceUnit

Fixes gh-983

Also an integration test that uses the (new)
@EnableGroovyTemplates to switch on the template conveniences
in a non-webapp

Fixes gh-990

The main difference for now is the removal of the --nohup
(slightly hacky) option in TestCommand. Now a TestCommand
can signal to its caller that it wants to be hung up.

Fixes gh-975

Actually the web-secure sample is misusing
security.basic.enabled=false (IMO) - it should be a flag
to say that you want to temporarily disable the basic security
fallback on application endpoins, not  way to disable all
security autoconfiguration.

Added test case to web-secure sample to ensure a user
can log in.

Fixes gh-979

Restore the dependency on commons-logging (transitively via spring-core)
for spring-boot. This means that we are not tied directly to SLF4J, but
it is still an option that can be used via `jcl-over-slf4j`.

The `spring-boot-starter-parent` continues to replace `commons-logging`
with `jcl-over-slf4j`.

Fixes gh-981