Added Wordpress, MongoDB, Laravel, Symfony, PhoneGap icons & SVG icons

This fixes issues #3, #4, #5, #6, also adds SVG.

Also, I think the with-build-scripts branch should really be merged into master now.

I had an enquiry from someone adding to the Atom editor package file-icons who was confused because the version of font-mfizz in master is the old version.

If you like, you could add me as a collaborator on this project, and I could handle these actions for you?

Thanks in advance.