fixed left and right margins
move the style into extra setter to easy change it
margin for repo list is fixed
Merge branch 'patch-1' of https://github.com/Zeromax/Gi7 into Zeromax-patch-1

Conflicts:
	Gi7/Controls/ProfilePanel.xaml
	Gi7/Views/HomeView.xaml
	Gi7/Views/RepositoryView.xaml