Merge pull request #82 from tgrk/master

Cowboy related fixes
replace non-working Google Apps calculator with Calcatraz
multiple IRC channels support
Merge pull request #83 from Mendor/master

Math plugin fix + multiple IRC channels
fix typos in README.md
Merge pull request #86 from nikai3d/patch-1

fix typos in README.md
Nick in XMPP MUC (#85)
contrib link fix in webadmin
Merge pull request #87 from Mendor/master

Fix for #85