Added a private collaboration tool.

And for those situations where you want to have your collaboration completely closed -- even to (sniff ... sniff) me -- I have embedded one more tool (www.liveminutes.com) at the bottom.  This allows you to select any combination of people that you want to collaborate with.  This is a free service that allows you to set up up to five different workspaces with different collaborative teams.  It syncs with Evernote and Google, and if you want, it allows you to voice and video chat.  So say you and one or two other teachers have something you would like to post on your group blog or enter into Workflowy, but would like to get each other's input on it first, here would be a secure environment in which to do that.