Making the user popover dismiss when the name link is followed.

Previously, if a user clicked on the name link in a user
popover, the link would be followed but the popover would
remain up. Now the popover is explicitly hidden before
the link is followed.

Fixes #303
Merge pull request #409 from DavidEBest/devel-popoverHide

Making the user popover dismiss when the name link is followed.