Length Validator

Custom validator for credit card length. Exposing an invalid length as a separate error from the card number validity.

Also added the skeleton for tests.

Merge PR#23

fix credit card icon position in example
https://github.com/laurihy/angular-payments/pull/23/files

Merge PR#50 and bug fixes

fix backspace and delete for Firefox
https://github.com/laurihy/angular-payments/pull/50/files
https://github.com/Fullscreen/angular-payments/commit/08939fef660da6631fdc5e714b3f488f5e889e1a

(don't ask about v1.0.4)

Merge PR#66

Ensuring card length validates properly
https://github.com/laurihy/angular-payments/pull/66/files

Merge PR#53

prevents non numeric characters in card number field
https://github.com/laurihy/angular-payments/pull/53/files

Merge PR#73 and bug fixes

jshint
https://github.com/laurihy/angular-payments/pull/73/files

v1.0.0

bumping version number to v1.0.0 and rebuild minified