First shot at SSL.

Wanted to get the ball rolling on including SSL in the mongo module.
Here are some notes:
  - Replica sets don't work fully with this commit, as the prefetch
    method is broken in the replset provider. The fix will come in
    a subsequent commit.
  - None of the SSL parameters are in global or params.
  - The mongo commands only take the --ssl parameter. Need to add
    support for sslPEMKeyFile and sslCAFile in case the user wants
    host verification. For right now this isn't a big deal since
    all of the mongo commands hit the loopback interface.

Fixed spacing