Merge branch 'buildSrc'

Added 'buildSrc' directory as a git submodule to be shared across
all Spring open-source projects. This eliminates the need to maintain
custom Gradle code within Spring Integration directly.

For a brief introduction to git submodules, see
    http://speirs.org/blog/2009/5/11/understanding-git-submodules.html

And of course the official documentation is at
    http://www.kernel.org/pub/software/scm/git/docs/git-submodule.html
    https://git.wiki.kernel.org/index.php/GitSubmoduleTutorial

Conflicts:
	spring-integration-twitter/src/main/java/org/springframework/integration/twitter/core/Twitter4jTemplate.java
	spring-integration-twitter/src/test/java/org/springframework/integration/twitter/inbound/SearchReceivingMessageSourceTests.java

spring-integration-xml/.settings/org.maven.ide.eclipse.prefs

@@ -1,9 +0,0 @@
-#Mon Mar 01 13:38:54 GMT 2010
-activeProfiles=
-eclipse.preferences.version=1
-fullBuildGoals=process-test-resources
-includeModules=false
-resolveWorkspaceProjects=true
-resourceFilterGoals=process-resources resources\:testResources
-skipCompilerPlugin=true
-version=1