Update Contributing.md
Update Contributing.md
Improve meta data description in Readme.
Override/add one property of an existing button

To be able override/add only a one property of an existing button.
Merge pull request #41 from ironlion/patch-1

Override/add one property of an existing button
Add Grunt badge.
Add Bower package badge.
Changelog.
v2.0.13
Merge branch 'master' into flat

Conflicts:
	contrib/css/github.css
	social-likes.css
Merge master, update deps.
Merge branch 'flat' of github.com:sapegin/social-likes into flat

Conflicts:
	src/social-likes.js