Settings: Allow access for external apps to launch ThemeSettings Fragment directly

Change-Id: I93b676d3eb570c7064eeb4217c8e420a186c8e32
Merge "Settings: Allow access for external apps to launch ThemeSettings Fragment directly" into cm-11.0
Merge pull request #15 from CyanogenMod/cm-11.0

/compare/cm-11.0...CyanogenMod:cm-11.0