Githawk: Add support for 1Password extension

[kt-weyert]

When GitHub asks for your password you can't ask 1Password to fill in the pass as the share button is missing

[rnystrom]

@kt-weyert actually you can! It's just in the "share" option in the Safari view.

[weyert]

Let me have a look at it again. Clearly it was already 2am when I created this ticket. Maybe I didn't see the Share button it wasn't on the keyboard. Sorry!