Added TogglWindow
Navigation menu is closed when ui interaction occurs outside it. Closes #194
Unsubscribing off TogglWindow events added
Merge pull request #223 from toggl/kaanjin-iosmenuissue

Close navigation menu when clicking outside of it. Fixes #194.

Conflicts:
	Ross/Ross.csproj
	Ross/ViewControllers/LogViewController.cs
	Ross/ViewControllers/RecentViewController.cs