Changed UI to match the latest Semaphore design changes (from their blog)

 - Removed unused text like "Last build: "
 - Relayout of the Project Details Header view (including some shadow <-- not sure about this)
 - ROUNDED project status view
 - Changed UITabBarItem colors to match the app visual identity
 - Added Inset Shadow to match Semaphore design. This was done via a new module called LayoutHelper
 	- LayoutHelper, in turn, uses a new pod called YIInnerShadowView
 - Finally, changed the cell background and project status colors as well as the 'medium' colors accoding to that Semaphore 'redesign post'.