fix typo on team page: s/honcho/hancho/

I found (maybe) typo on http://rubykaigi.org/2013/team page and fixed them. Could you please merge it into the master, if necessary?

* typo?: HONCHO
* looks HANCHO * 班長 * in Japanese


I really appreciate your great work on RubyKaigi 2013 and am looking forward to see the Kaigi teams at RubyKaigi 2013!!