Update ConfigurationMetadataAnnotationProcessor so that `prefix` is
only obtained when the annotation is not null. Also improve exception
message by including the element.

Make spring-boot-integration-tests a top level project and move the
existing gradle tests and security tests to be sub-modules.

Update invoker configuration so that only folders with a pom.xml file
are invoked. This helps when switching between the 1.1.x and master
branches since empty folders left by git no longer fail the build.

* derby:
  Add dependency management for Apache Derby

Closes gh-2413

* pull2524:
  Update documentation on resources filtering

Add an explicit note about the spring-boot:run goal that prevents the use
of resources filtering by default.

Undertow’s WebSocket client sends an illegal Origin header – it does
not include the scheme, e.g. it’ll send “localhost” rather than
“http://localhost”. This commit works around the problem by allowing
access to the SockJS endpoints from any origin, thereby disabling
OriginHandlerInterceptor’s checking of the Origin header.

Fixes gh-2473

This reverts commit 34ede2f3.

Fixes gh-2212

Closes gh-2429

Update the `init` command to support the latest meta-data format. Recent
Spring Initializr version also supports Spring Boot CLI now and generates
a textual service capabilities when requested. The command no longer
generates the capabilities of the service unless said service does not
support it.

Closes gh-2515

Closes gh-2512

Closes gh-2511

Closes gh-2510

Closes gh-2508

Closes gh-2507

Closes gh-2506

Fixes gh-2493

Fixes gh-2518

Fixes gh-2473

Fixes gh-2474

 - Correct typo (coercable -> coercible)
 - Update description to reflect that Spring 4.1.5 supports the
   expansion of array properties and and a test that verifies the
   behaviour

Closes gh-2304

Closes gh-2503

Closes gh-2502

Closes gh-2501

Closes gh-2500

Closes gh-2499