fix infinite loop in bang-bang

If you say "hubot !!!", you can cause bang-bang.coffee to go into an
infinite loop. This is because:

1. The filtering only removes entries that are exactly "!!"
2. The `respond` will match anything that starts with "!!"

Thus, hubot will go into an infinite loop like so:

    user: hubot !!!
    hubot: !!!
    hubot: !!!
    hubot: !!!
    hubot: !!!
    ...
Add script to display GitHub zen message from their zen API
Add GitHub Search script

Uses GitHub's brand new code search API. Example use:

  hubot github search bigdata
  hubot github search rails/rails ActiveRecord
add scraper for developerexcuses.com
listen for soundcloud links and show information
Fixed not sure if meme.  Added ability bring in memes from imgur.  Added Pay the Iron Price, Brace Yourself, Aliens guy, and One does not simply memes
Move achewood.coffee into the scripts directory
Remove duplicate dependencies information from tweet-content.coffee
fixed problems with tvshow.coffee, xml returned was different than expected
restored comment
added newline to eof
Adding the httpcat plugin. Returns a specified http status code as portrayed by a cat.
Stringifying the status codes to match up with the incoming match from the regex. Adding 'not found' message.
Change the regex in such a way so that user's name is stripped automatically.

- Thanks to @technicalpickles
Expand URLs before displaying them
Link directly to the image URL when handling media

This is handy for those running textual with inline images turned on
Decode HTML entities
Merge pull request #1052 from plukevdh/developerexcuses

add plugin to get excuses from developerexcuses.com
Merge pull request #1050 from prathamesh-sonpatki/strip-whitespace

Strip whitespace from user's name
Merge pull request #1040 from spajus/github-search

Add GitHub Search script