updates category model.
adds platform and technology models
update challenges index page.
adds challenge show page.
initial commit
adds discussion board view for challenge.
adds rss feed for challenges
merge bootstrap-typeahead for member/challenge search.
added live content
removed commented out code
tweak
implements controller/model api for creating comments of challenge.
updates the position of reply form.
initial commit
cached guest token
finished signup page
refreshes from box
fixed register button
added passing parameters for find
rss feeds