convert M.PageTransition into a singleton
Merge branch 'absinthe' of https://github.com/mwaylabs/The-M-Project into absinthe

* 'absinthe' of https://github.com/mwaylabs/The-M-Project:
  implement setChildView
  bugfix menu transition out
Merge branch 'absinthe' of https://github.com/mwaylabs/The-M-Project into absinthe

* 'absinthe' of https://github.com/mwaylabs/The-M-Project:
  refactor menu js
Merge branch 'absinthe' of https://github.com/mwaylabs/The-M-Project into absinthe

* 'absinthe' of https://github.com/mwaylabs/The-M-Project:
  rename attachedToDom to getsVisible
  bugfix for modal backdrop
add getChildView method
Refactor isFirstLoad property
Refactor split-layout
Merge branch 'absinthe' of https://github.com/mwaylabs/The-M-Project into absinthe

* 'absinthe' of https://github.com/mwaylabs/The-M-Project:
  close #128
  add test for the menu