Invite non-C9 Users to Workspace

[Ecksters]

Just a suggestion, I recently wanted to invite a friend to a workspace, and found out they would need to have a C9 account before I could do so, perhaps it would be nice to have the option of sending an email inviting people to join C9 should they not have an account when you try to share your workspace with them.

[bmatusiak]

Currently, Viewing code is allowed only by users who are logged in...
But, Previewing or Viewing running app is allowed by non-logged in users..(depending on share settings on workspace)