added motion_layouts method
use string, not symbol
added motion_layouts method
use string, not symbol
call the method `auto` and use instance_exec.  @qrush made me do it!
Merge branch 'motion-layouts' of github.com:rubymotion/teacup into motion-layouts

Conflicts:
	lib/teacup/z_core_extensions/ui_view_controller.rb
added some documentation
raise error if motion-layout is not installed
Merge branch 'master' of github.com:rubymotion/teacup