Update gradle and build tools to latest versions

Gradle 1.8 -> 1.11
Gradle Android Build Tools 0.8 -> 0.9.+
Build tools: 19.0.0 -> 19.0.3
support library: 19.0.0 -> + (Detach hard dependency on v19.0.+ of support library - from #70)
Merge pull request #2 from austynmahoney/fixes/build-tools

Update gradle and build tools to latest versions