Settings: more improve Active display [2/2]

1. fix http://jira.omnirom.org/browse/OMNI-651
2. fix http://jira.omnirom.org/browse/OMNI-641
3. add http://jira.omnirom.org/browse/OMNI-652
4. Add option Double tap to sleep every where
5. Add option to show and choose wallpaper behind active display
6. Allow to show numbers of notification on Handle
7. minor improvements
8. add battery circle around handle

string rework

recalc brightness to % value

PS2: Update author
PS3: fix Seekbar

Change-Id: I1b8ad37a650f9e642f9ff2943675620b1b96a578
Merge "Settings: more improve Active display [2/2]" into pac-4.4