Allows a label tag paired to a field container to defer focus to the field
Allows a label tag paired to a field container to defer focus to the field

- Finds labels paired to containers via for-id match
- Sends hostedField:${type}:focus! event when label is clicked/tapped
- This will not work with mobile Safari due to strict focus event constraints. See [this][so]
- Fixes #240
- Fixes #271

[so]: http://stackoverflow.com/questions/12204571/mobile-safari-javascript-focus-method-on-inputfield-only-works-with-click#answer-16601288

Signed-off-by: Christopher Rogers <551f4eee005e3e519560e2feb8988249d292c73e@gmail.com>

recurly/recurly-js,recurly/recurly-js,recurly/recurly-js