Added gradle wrapper
Upgraded to Gradle 2.0-rc-1
Removed gradle 1.x / java 8 warning from settings.gradle
Set source compatibility 1.7 for default and 1.8 for each module that overrides the default
Fixed javadoc link for Java 8/Gradle 2.0-rc-1
Upgrade to gradle 2.0
Merge branch 'gradle2'