Explicitly require rake to avoid jettywrapper failure

Tests blow up when run in RubyMine without this line.

See projecthydra/jettywrapper#31
Ensure that jetty is running for tests
Add instructions about how to set up jetty
Need to unpack and clean jetty before starting
Ensure that our tmp directory exists

Jetty needs it for setup.
Wait longer for jetty to fully boot
Merge branch 'master' into deposit-submission-into-fedora