Update Twitter links compasssusy -> sasssusy

@CompassSusy no longer exists. @SassSusy is the new Twitter handle[1].
This commit updates the links pointing to the old Twitter account.

[1]: https://twitter.com/SassSusy/status/416029969697878016
Bump copyright year 2013 -> 2014

Happy new year!
Merge pull request #269 from lencioni/twitter

Update Twitter links compasssusy -> sasssusy
Merge pull request #270 from lencioni/2014

Bump copyright year 2013 -> 2014
Ignore .bundle
Add bower.json
Updates sites-using-susy.html.md with SmithsonianMag.com
Merge pull request #291 from lincolnloop/master

Updates sites-using-susy.html.md with SmithsonianMag.com
Update sache/bower details
Fix get-layout() math