Clean fix for issue #48, introducing Font Awesome for icons

Heya Felipe,

I figured why adding this line broke things:

_loadStyle(_settings.PPWSrc+"_styles/font-awesome.min.css", "PPW.setLoadingBarStatus()");

The method setLoadingBarStatus uses the loadSteps configuration value, which defaulted to 6. Loading the font-awesome stylesheet adds another step, for now i solved the problem by making loadSteps default to 7.

Another issue is in the PPWSrc configuration value, some browsers don't like URI's with double slashes '//' ... for now i've removed the trailing slash from the variable and made sure appended paths start with a slash throughout the code.

Mazzel,

Martijn.