Reserve system

I spent much too long removing reserved users from solr and then reverting those changes.

In any case, users who are in reserve are not sent saved search emails. I also added a check of in_reserve to User.can_receive_myjobs_email to hopefully prevent additional emails.

I may have missed a few bits and am open to suggestions.

All tests pass.
Ah. Well, if it aint broke..

@almathew , did you see the comments about updating the solr schema?

@troy - I didn't see any new verbiage. Other than running the test suite, are there any observable changes here, or am I just manually inspecting the diffs as I have been?