Adding support for google text attribute
text is optional argument for fontapiurlbuilder
escape replaced by encodeURIComponent
calling of webSafe is unnecessary, encodeURIComponent will take cake about safe
tests for executing build of font url with text attribute
removed redundant tests and added test to check case of empty text
Merge pull request #75 from hash3g/master

Adding suppport for "Optimizing your font requests (Beta)"