upgraded manifest & automatically add password for username

Hi,
I loved the way Firefox filled out automatically the password field.
So I added this feature to my chromeipass fork.

For the fillPasswordOnly function I added the username field to the fillLogin-request because of the multiple logins. If a username is filled in, the fillPasswordOnly function will detect the correct password for the username and use this instead of giving a warning because of multiple logins.

The warning for multiple logins only appears if no login-username matches the inserted username.

I also upgraded the extension to manifest 2 which is neccessary for publishing an update of chromeipass (http://developer.chrome.com/extensions/manifestVersion.html)

Best regards
lspcity