Closes gh-3098

* cache:
  Polish Javadoc

Closes gh-3101

Add OrderedHiddenHttpMethodFilter and use it in WebMvcAutoConfiguration
to ensure that it is applied before Spring Security.

Fixes gh-2773

Update MetricsFilter so that failures to record metrics are logged and
ignored.

Fixes gh-2777

Update `ConfigurationPropertiesReportEndpoint` so that properties that
are set with a Boolean class but read with a boolean primitive still
appear in the report. The allows the Endpoint.isEnabled() property to
be displayed.

Fixes gh-2929

Fixes gh-2730

Extract @ConditionalOnEnabledEndpoint to a top level class.

See gh-2798

Update ChangedFile to clean paths when returning the relative name.

See gh-3082

Closes gh-3020

* gh-2419:
  polish mail jndi support
  Add mail jndi support

Closes gh-2419

See gh-2419

Closes gh-3077

See gh-2633

See gh-3082

Closes gh-3077

Tweak timings for some tests to fix failures that only occur on Linux
machines.

See gh-3082

Add a sample application that demonstrates how the
`spring-boot-developer-tools` module can be used.

Closes gh-3082

Update the remote endpoints to use 'shared secret' authentication.
Secrets are provided as Environment properties and transfered using a
custom HTTP header.

See gh-3082

Update RemoteClientConfiguration to warn the user that they really
should be using HTTPS.

See gh-3087

Provide auto-configuration for remote debugging over a HTTP tunnel.
The RemoteClientConfiguration provides a server that the local IDE can
connect to. When a client connects the remote connection is established
using the HTTP tunnel.

See gh-3087

Add server and client components to support tunneling of binary TCP
protocols over HTTP. Primarily designed to support Java's remote
debug protocol (JDWP).

See gh-3087

Add livereload support to RemoteClientConfiguration which is triggered
whenever updates are pushed to the remote application.

Closes gh-3086

Provide auto-configuration for remote application update and restart.
Local classpath changes are now monitored via RemoteSpringApplication
and pushed to the remote server.

See gh-3086

Add server side component to allow remote updates and restarts to a
running application.

See gh-3086

Provide application auto-configuration to provide remote endpoint
support along with a client-side application that can be used to
establish connections.

See gh-3086

Add MVC style Dispatcher, Mapper and Handler classes to support remote
server calls. Spring MVC is not used directly since it may not be on the
classpath (for example if the user is developing a Jersey application).

See gh-3086

Update the `Restarter` so that class files and resources can change
independently of the underlying source folders. This change will
allow updates to be pushed to a remotely running application, without
requiring the application to run in an exploded form.

See gh-3086

Add auto-configuration to start and trigger livereload.

Closes gh-3085

Add a "restart" Spring `Scope` that remains between application
restarts. Allows beans such as the livereload server to remain active
during restarts and not disconnect clients.

See gh-3085