Export CSV

## Export CSV
* User can now download CSV or XLS for campaign payments 6fad105ecf4ab1b471891d98efa6cc188039640e
* Exported file will display date and amount correctly 10305e10607c9bfb0f8568c6bbf58acbe867dde0 with user-friendly column names 5eb3a1da7add5c6ff8dd95c38d1a463db56ab6eb

P.S. My bad on the trailing whitespace. Sublime settings were messed up...