Add :classifier and :prep-tasks keys

Build the site and metadata by default, and package the metadata in a jar with a
"meta" classifier.
Update crate versions
Update to lein-pallet-crate 0.1.1
Add release script
Updated project.clj, release notes and readme for 0.8.0-alpha.1
Move snapshots profile to profiles.clj
Update to git 0.8.0-alpha.1
Merge branch 'release/0.8.0-alpha.1'