Added some rate limiting the the ajaxform class
Added some rate limiting the the ajaxform class

If we try to submit a second time while the first submit is still in
progress, wait until its done.  This way if someone tries to submit the
form multiple times in quick succession, we only need to process the
first and last time.

pculture/unisubs,pculture/unisubs,pculture/unisubs,pculture/unisubs