Updated Android Gradle plug-in 0.13.0 in prebuilts (take 2.)

Change-Id: I5f5cb45ef7028965353c5006e6501038253dcfc1
Merge "Updated Android Gradle plug-in 0.13.0 in prebuilts (take 2.)" into idea133
Added gson dependency

Change-Id: I9bda92e16709b69df968ed35c98b521a681d14f5
Merge "Added gson dependency" into idea133
merge in ub-tools-idea133-release history after reset to f9b7725904cbb86862d37ce1b5ca8975919ba380
merge in ub-tools-idea133-release history after reset to f9b7725904cbb86862d37ce1b5ca8975919ba380
merge in ub-tools-idea133-release history after reset to f9b7725904cbb86862d37ce1b5ca8975919ba380
merge in ub-tools-idea133-release history after reset to f9b7725904cbb86862d37ce1b5ca8975919ba380