Added processName for #2

Adds `processName` as per my comment in #2: https://github.com/hojberg/grunt-yui-config/issues/2#issuecomment-19390404

I was able to solve the issue outlined in https://github.com/hojberg/grunt-yui-config/issues/2#issuecomment-19379031

However, I have not tested against the issue in the OP of #2 yet, but will do that tomorrowish.