Refactored the abstractViewController for new design and to completely abstract the navigationBar

Updated design, navigation bar handling, controller init (defaults), background and many other stuffs

#time 4h
more generic main implementation
project file updated for new files / images
Updated controllers for new abstraction nuxeoViewcontroller, + improved home
Updated xib that ignore the navigationBar w/ navigationBar complete abstraction
ControllerHandler settings for viewcontroller w/out navigationBar and small refacto
Clean ressources, old assets
git ignore updated for podfile.lock
Fixed conflict and merge w/out issues