Merge tag '0.3.9' into develop

Vist 0.3.9 on the world
pre arities
Reformat and break apart eamples
Add examples broken out of 1564827499.clj
Fix #116
Fix #115
Remove duplicate slash
Remove the static snapshot
Fix #117
Start thinking about sessions
Implement {group,artifact} pages and artifact URLs

Fix #114
Update 1340090541.clj

Fix overkill HTML escaping
Move all the data files into a subdir
Refactor the rest of the site with the new data prefix
Fixup with new cheatsheet build
That shouldn't be there..
Fixup route logging
Tweak sidebar
Update API
Update API docs