updating groups

Most of the work Eric and I did today is on groups. We added the ability to change the level of people already in a group. I ended up doing quite a bit of refactoring in group_involvements_controller to make things a bit cleaner and concise.

We also made it so that interested requests don't need to be approved. It's kind of silly to require approval to be interested. That meant we could reduce the amount of text on the dashboard for requests and not show the role requested (it will always be 'member'). Later we will add an option when creating/editing the group to toggle whether member joins require approval.

I also made the CMT work in IE by turning on IE7 compatibility mode. I also had to tweak the tooltips javascript slightly as it was getting an error in IE.