number type support

this way the qty input can be number type. without adding the support it adds only 1 item regardless the value of the input
Merge pull request #356 from robrainfall/master

number type support
Revert "updated google checkout methods"

This reverts commit 65246d0bfd66f8253e5f44e4dfc10c6108e2e6a8.

Conflicts:
	README.md
	simpleCart.min.js
Added support for notify_url input in Paypal Checkout method
Added support for notify_url input in Paypal Checkout method
Merge pull request #372 from gvegodev/master

Added support for notify_url in Paypal checkout method
Merge pull request #367 from AndrewKvalheim/issue/343

Don't use the Google Checkout API for Amazon Payments.
Updating minified source from the pull request by AndrewKvalheim:issue/343