Initial checkin for changefeeds tutorial
Changefeeds tutorial, first draft
Updating to reflect code review feedback
Removing superfluous r.
Removing superfluous r.
Fix r.time + add io field for r.arg
Merge pull request #352 from rethinkdb/michel_347_last

Fix python docs (2)
Merge branch 'slava_feeds_tutorial' into v1.13
Merge branch 'slava_feeds_tutorial' into v1.13
Remove mentions of protobuf in the drivers
Add python to the build dependencies
First pass at docs for issue #306
updating http docs and copying to ruby and python