Adds a pallet project file

This is a basic pallet configuration.  It creates a vm running clojars from a
local checkout using the test data.

To use it:
 lein pallet add-vmfest-image \
   https://s3.amazonaws.com/vmfest-images/ubuntu-10-10-64bit-server.vdi.gz
 lein pallet up

If you think this might be useful, we could improve it as needed.