Start working on YouTube link handling

Start working on handling YouTube links correctly.

Minor changes

Make the dispatch function for handle-privmsg use the passed in
nickname, rather than referencing the global variable directly.

The bot now recognizes YouTube links

The bot now will reply to you with the title, viewcount, likes and dislikes of
YouTube links.
Cleaned up formatting of Youtube video information
Further tweaks to YouTube links.

Video titles are now in bold.
Wikilinks

The bot now interprets [[ ]] links as wikipedia links and turns them into
http://en.wikipedia.org/wiki/<link_text>.
More wikilinks

Accidentally broke handling of normal messages by using nil? instead of empty?
Added dependency on clj-time

We need clj-time to parse YouTube durations.
Added duration parsing

YouTube videos now have their durations displayed.
Merge branch 'youtube-links' of github.com:quanticle/clojure-irc into youtube-links

Conflicts:
	src/clojure_irc_bot/indirect_commands.clj