Changed the default bootstrap icons for Elusive Icons

http://aristath.github.com/elusive-iconfont/
First version of the Bill Interface
Updated the Bill model to reflect new featuers
Now loans contain a reference to the bill that created it
First working version of the bill generating loans
Minor usability changes in the bill interface
Re enabled the emails
Merge branch 'master' of github.com:magnet-cl/magnet-bank

Conflicts:
	loans/models.py
New migration to create bills
Deharcodeated the buying of a subway
Now product stores the loan that bought it