Merge pull request #43 from diegotori/master

variantToNotes, variantToNotesType, plus Java and Android Gradle Plugin compatibility fixes.
Fix versions during http://central.sonatype.org/articles/2014/Oct/28/enforcing-valid-dependency-versions/
[Gradle Release Plugin] - pre tag commit:  '2.4'.
[Gradle Release Plugin] - new version commit:  '2.5-SNAPSHOT'.
Update README.md
Update README.md