Ensure WORKINPROGRESS reviews are at the bottom of the list.

WORKINPROGRESS reviews should not be at the top of the reviewday list
for a given project. The score will always be 0 for WIP reviews and
the subject line (in the generated report) will be prefixed with
a '(WIP): ' to indicate it is work-in-progress.

Change-Id: I32f7e08341dcbf1a0aa965a5f377c7fdc8613ead