Moved a lot of JS into assets.
Converted views to HAML.
Converted forms to SimpleForm.
Fixed typo.
More converting to HAML, SimpleForm and in general fixes.
A lot more work on converting everything to HAML and SimpleForm.
Removed unused methods and changed to using CanCan for checking if users can view invoiced and remove.
Removed more methods.
Converted previous functionality to Rails validations.
Merge pull request #5 from kaspernj/kj/rails_improvements

Rails improvements