Bill history tab per user

Added new bill history component as a myaccount tab
Also added to admin edit
Provide user feedback when no bills are found
Highlighting open bills

![billhistory](https://cloud.githubusercontent.com/assets/3430891/5324461/ce76551e-7ca8-11e4-91de-8886f17fdb7d.PNG)

use `transaction.getBillHistory` instead of the string version, it is more reliable in terms of static checks.