Update to Android Gradle Plugin 0.13.2, Gradle 2.1

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Switch from mavenCentral to jcenter

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Add versions plugin

Android's version lint check is nice, but it only checks projects
it knows about.

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Update picasso version to 2.3.4

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Update to 1.1.13 version of Crashlytics SDK

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>
Move requestWindowFeature back to onCreate to resolve #129

Signed-off-by: Greg Meiste <greg.meiste@gmail.com>