Add emojis and party gifs

Submitting 2 scripts that I think have broad appeal.

emoji.coffee - Replaces :text: or text with emojis.	 fb430e7
party_gifs.coffee - Make a GIF on the fly from search terms.	 3660af8

The emoji script is useful for IRC users who don't have emoji support in their clients.

See http://blog.joshdzielak.com/blog/2012/11/24/make-on-demand-gifs-from-search-terms for more info about how the party gifs script makes the gifs.