Update intro command

Update the introduction command to add a link to PS forums important thrad "A Beginner's Guide to Pokémon Showdown".
Add Global Showdown format

Add Global Showdown format, first Nintendo's take at an official singles Ubers tournament (http://www.smogon.com/forums/threads/2013-global-showdown-nintendos-official-3-vs-3-ubers-tournament.3486033/).
Hide UU format temporarily

The UU suspect needs more playerbase, so hide the UU format temporarily.
Update !om links
Merge remote-tracking branch 'upstream/master'