Fix for decode.py for ST3

Was getting the same error here -> https://twitter.com/ZURBuniversity/status/522445801511858176

Opened the packaged up, I am new to sublime and fairly okay in Python. I googled some and came to know that the signature for begin_edit() and end_edit() has changed.

I am assuming here 'foundation-grid' was a token?

 Hope this helps.