Add JS flash module
Change required fields on form
Add errors messages to i18n
Refactor payments JS

Now it uses Flash module
Add other error messages
Improve error message
Improve JS to be easier to read
Merge pull request #17 from neighborly/jl-improve-errors

Improve errors when adding new cards
Merge branch 'master' into im-card-page-improvements

Conflicts:
	app/views/neighborly/balanced/creditcard/payments/new.html.slim