Add comment about socialMedia.js directive.
Move social ng templates to templates/social.
Define global isPresent method to check for falsy values.
Add .DS_Store to .gitignore.
Use isPresent to present/hide link buttons.
Use angular.js built-in falsy values.
Merge branch 'master' into disable-link-button-9
Use generic name URL to DRY up socialMedia.js.
Add methods to socialMedia.js.

The goal of this commit is to DRY things up.
* Add isDisabled
* Add link().
Disable button if URL link is empty.
Fix bug with isDisabled for dribbbleForm.
Fix yet another bug with DribbleForm.
Merge pull request #19 from vitaliyg/disable-link-button-9

Disable link button 9