sync changelog
coupon form fix
Fixed Admin Login, Paypal

Fixed a problem with admin login authenticating without the username.
Also removed the config option for currency from the paypal module,
integrating it with global settings.
Updated Changelog
Merge branch 'Master' of https://github.com/gocart/GoCart into Master

Conflicts:
	changelog.txt
Merge branch 'Master' into 2.0-Development