(PE-3025) Change to dev-resources

Switch from using test-resources to using dev-resources, as
leiningen automatically includes dev-resources.
Merge pull request #153 from fpringvaldsen/change-test-resources

(PE-3025) Change to dev-resources
(PE-3215) documentation now lives in the wiki

Delete most of the documentation from the README and the doc/ directory;
it's all been copied over to the Github wiki already.

Leave a minimal README in place.