Remove Teambox central tracking code

http://teambox.com/logo.png returns 404 anyway
Changed reference to crewmate in apidocs controler
Merge pull request #117 from kyzh/apidocs_controler

Change reference to crewmate in ApidocsControler, refs #101
Change reference to crewmate in emailer's model, refs #101
Merge pull request #118 from kyzh/emailer_model

Change reference to crewmate in emailer's model, refs #101
Changing footer according to #116