Change actionview helpers to accept options

This will allow us to use any of the rules ::Money.format allows,
like :html, for instance.

Also clean up a bit of duplicated code.

Change-Id: I4037d0b6c7bf34b968c33439e02fa020f721a72b
Merge pull request #100 from freerunningtechnologies/switch_helper_to_options

Change actionview helpers to accept options