USERGRID-208 License headers for all XML files

Hi Folks,
Final commit simply adds license headers to all XML files e.g. 
```
	modified:   sdks/android/m2/repository/org/usergrid/usergrid-java-client/maven-metadata-local.xml
	modified:   stack/cloudbees.xml
	modified:   stack/m2/repository/com/apple/AppleJavaExtensions/maven-metadata-local.xml
	modified:   stack/m2/repository/net/tanesha/recaptcha4j/recaptcha4j/maven-metadata-local.xml
	modified:   stack/m2/repository/org/usergrid/usergrid-java-client/maven-metadata-local.xml
	modified:   stack/rest/src/test/resources/project.properties
	modified:   stack/rest/src/test/resources/usergrid-custom-test.properties
	modified:   stack/rest/src/test/resources/usergrid-rest-deploy-context.xml
	modified:   stack/rest/src/test/resources/usergrid-test-context.xml
```
Once these ones are committed we only have 
javascript	
x-c		
x-java-source	
x-sh

Then we can roll a release candidate... I think.