Fontcustom to grunt-webfont

This commit miss the skip part (see todo in the Gruntfile)
Merge latest modification of master
Merge branch 'master' into grunt-webfont
Add skip part for the 'webfont:svgToFonts'
Latest adjustement to README to remove fontcustom script in favor of grunt-webfont task
Merge with latest master
Oups… Fontcustom residue
Merge pull request #30 from kud/grunt-webfont

Grunt webfont