detect if device support for Proximity/Gyroscope sensor
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
9. remove wallpapper
10. add omni sensor check

change string to better explanation for feature
thanks @Pulser and @Jiangyi

Change-Id: I1b8ad37a650f9e642f9ff2943675620b1b96a578
[2/2] Settings: On-The-Go

Change-Id: Ic74579708dc4ff030cca97f1f5972dce105431d8
update notifications warning summary