update android gradle plugin to 0.14.4

Hi,

[Android Studio 1.0 RC 1.0](http://tools.android.com/recent/androidstudio1rc1_releasecandidate1released) was released in the [canary](http://tools.android.com/preview-channel#TOC-Android-Studio-Previews) channel.
It depends on [Android Gradle plugin](http://tools.android.com/tech-docs/new-build-system) at least 0.14.0.

With this PR you can update your AS when you want and all works as expected.

Be warned:
Android Studio 0.8.14 in Beta Channel is not working with Android Gradle plugin 0.14 
see http://stackoverflow.com/questions/26680972/unsupportedmethodexception-android-studio-0-8-9
so when you not update your AS then you should not merge this!