Merge pull request #88 from VictorLowther/fix-runs-glitch

+2 (already tested) Get rid of some special-casing in run.rb
Have snapshot.rb take over the last remaining unique functionality in deployments.rb.
i18n-ize the system deployment description.
Remove most references to snapshots from the documentation.
Remove snapshot unit test
Remove snapshots from the Crowbar API.
Hack up the API bindings to remove snapshot stuff.
Make finding the system deployment a bit more DRY