The search query is tested against user tags as well now

This search query only works for the following pages:
- Institutions -> Members

For example, one can search for
lastinstitution:Foo Bar Institution
and the results would be all the users that were in the
Foo Bar Institution for their last insitution

Change-Id: I2af823911346af5b9fdc8ae64b92d329f03dff5c
Signed-off-by: Hugh Davenport <hugh@catalyst.net.nz>