Update build files
 - Update build to Gradle 2.0 (be mindful of += with collections)
 - Apply bintray and coveralls plugins
 - Setup aggregate cobertura reports
 - Switch back to jcenter() in repositories as build is now Gradle 2.0 compatible
 - Update cobertura classpath with jfxrt jar
Apply source/target compatibility to all subprojects; Shutdown pedantic doclint in JDK8+
Merge pull request #122 from aalmiray/update_gradle_build

Update build files