Upgrade to ABS 4.3.0

https://github.com/JakeWharton/ActionBarSherlock/blob/master/CHANGELOG.md
Upgrade to ABS 3.5.3

This includes the fix for proguard usage on Mac with non-Apple JDK (ie
Java 7 from Oracle, which is the new default)

https://github.com/jayway/maven-android-plugin/pull/197