color scheme preference
holo-light sass/css
load preferences function
fix FC when opening settings
use default value
fix actionbar icon hover still beeing blue
https://github.com/macdonst/AppPreferences/pull/1
pass preferences to success callback
show header once only
apply preferences on start and settings change
Merge branch 'feature/holo-light' into develop
Merge branch 'release/2.7.1'