Added polish translation

Created by:
- M. Kucharskov (added in contributors)
- P. Kowalczyk (no added cus, she don't have XDA profile)
add support to miuiv5
add static miuiv5 variations
add support for miuiv5 tickerview
Detect dimming, broken right now
Plugin download implementation
add support for autodetect miuiv5
Merge pull request #73 from kqstone/miuiv5

MIUI V5 support
Merge pull request #72 from Kucharskov/master

Added polish translation
SystemProperties is private API, use reflection instead.
GradientDrawable is now OverlayDrawable with support for two overlays
Remove tacky ListView animations, replace library in contributors.xml
Configurable overlay mode
Use instanceof instead of catching ClassCastException
Remove custom padding in ActivitesListActivity
Use notifyDataSetChanged instead of invalidateViews
Add gradle build files