update tab content on login/logout or comeback to screen
list dividers
divider for chalenge lists
Merge branch 'unstable' of https://github.com/stestaub/drallo-app into unstable

Conflicts:
	DralloAndroid/DralloAndroid.csproj
	DralloAndroid/Fragments/ProfileFragment.cs
	DralloAndroid/Resources/Resource.designer.cs
	DralloAndroid/Resources/layout/drallo_list_item.xml
	DralloAndroid/Resources/layout/grid_with_header.xml
	DralloAndroid/Resources/layout/list_with_header.xml