Copying in test-kit.
Integrate Launcher into Gradle Runner framework and use in IntegrationSpec
Merge branch 'gradle-1.11' into test-kit
Add test to ensure files in our current class path are available.
Merge branch 'gradle-1.11' into test-kit
Add docs
Merge pull request #12 from nebula-plugins/test-kit

Copying over test kit
Merge remote-tracking branch 'origin/gradle-1.11' into gradle-1.12

Conflicts:
	src/main/groovy/nebula/test/IntegrationSpec.groovy