Adding some explicit deps for jars that were not resolved

Could not resolve all dependencies for configuration ':spring-xd-dirt:compile'.
> Artifact 'org.springframework:spring-web:3.1.3.RELEASE@jar' not found.

Could not resolve all dependencies for configuration ':spring-xd-tuple:compile'.
> Artifact 'org.springframework:spring-asm:3.1.3.RELEASE@jar' not found.

and removed mavenLocal() and added springsource repo to resolve issue with

Could not resolve all dependencies for configuration ':spring-xd-gemfire-server:compile'.
> Artifact 'commons-beanutils:commons-beanutils:1.6@jar' not found.finall
XD-59 - Tuple should support storing nested tuples
XD-99 - Fix Sonar build

* Upgrade to Gradle 1.6
* Use Sonar-Runner plugin instead of Sonar plugin
Merge pull request #10 from ghillert/XD-99

XD-99 - Fix Sonar build