import emoji code from fork.

this is a terrible, terrible hack. (since emojify embeds as a CSS with data-urls, this results in a 5.3MB css file -- and that's minified)
fix the ":/" part http:// or etc from becoming a sad emoticon. sad links. keep diff on hand in case emojfiy.min.js is updated in the future
Add a Gruntfile.
Merge pull request #422 from arlolra/252-jshint

Add a Gruntfile.
Merge branch 'master' of https://github.com/cryptocat/cryptocat into emoji