(PE-1345) move doc/clj files from experimental to v3

This commit moves various documentation and http endpoint files
from the `experimental` locations to the `v3` locations.  No
other changes are made in this commit, so that the actual
modifications will be easier to see in subsequent commits.
Update namespaces and URLs for new v3 endpoints
Merge pull request #646 from cprice404/maint/burgundy/PE-1345-move-endpoints-out-of-experimental

Maint/burgundy/pe 1345 move endpoints out of experimental