variantToNotes, variantToNotesType, plus Java and Android Gradle Plugin compatibility fixes.

Addresses Issue #42. Also added support for variantToNotes and variantToNoteTypes. This in turn will enable users to send alternate release notes for a given variant (that and it makes it easy to add the current build's configuration for that variant into said release notes). Also, the Android Gradle Plugin's now building to 0.14.+ (although 1.0.0-rc1 came out today, thus I held off on building it to that one at the moment).