Fixed Minified version not working

This pull fixes issues with minified version not working
The base pdfkit library used some code ([**here**](https://github.com/devongovett/pdfkit/blob/master/lib/font/table.coffee#L3-L3) and [**here**](https://github.com/devongovett/pdfkit/blob/master/lib/font/ttf.coffee#L71-L80) that rely on function names at runtime; 

as the uglify task enable name mangling for function name...