Install Haml

* The new template engine for the app is now Haml.

https://github.com/Moneyvate/moneyvate-core/issues/2
Convert Application Partials to Haml

* All partials in app/views/application have been re-written
  in Haml.

https://github.com/Moneyvate/moneyvate-core/issues/2
Convert Application Layout to Haml

* The main application layout has been re-written in Haml.

https://github.com/Moneyvate/moneyvate-core/issues/2