Update to 5.1.2

Change-Id: Ieb2eb232b8dd700700d8f8b587c3f774c48ae9d8
Fix versionCode double increase

The versionCode was being increased twice, resulting in a different
versionCode between the one used for the APK and the one used for the
versionName.

This remedies that by calling just the versionCode rather than calling
increaseVersionCode().

Change-Id: Id37f1ac3ad4d8724b12a7916e1d81bc24076a308