Genericons: Bump to v3.0.3
Bunch of updates mostly.
- Two new icons, Dropbox and Fullscreen.
- Updates to all icons containing an exclamation mark.
- Updates to Image and Quote.
- Nicer "Share" icon.
- Bigger default Linkedin icon.
Merge pull request #114 from Automattic/merge-20140101

Genericons: Bump to v3.0.3