Added README.MD
Remove previous README.MD and added README.md
Crete groups controller, first draft
Route for groups controller
Show users in the "who spent?" select when adding a spend
Save a expense with a authenticated user
Model Expense associations to User model
Migrations and associations to tags with expenses
Install angular-ui
Install select2-rails
Implement select2 for owner field when create an expense
Tags input in view
View tags when creating an expense
Save tags for a expense