Use "recur" special form instead of simple recursion

"drone-do-for" had a tail position recursive call. This commit
replaces the tail call with the "recur" special form and adjusts
the argument list as required by recur.
See http://clojure.org/special_forms#recur
Merge pull request #2 from bruceadams/use-recur

Use "recur" special form instead of simple recursion
cleaning up to support showing video and opencv
basic working with multi-drone
basic working with multi-drone
default to non-opencv in video
cleaning up
move navdata associated with drone atom - prepare for multi-drone
merging and making sure face recognition works
update readme for face recognition
Multi-drone support
bump version & include multi-drone support
fight with markdown
more markdown fixing
more explicit
credit where credit is due
refactoring navigation data for multi-drone
refactoring navigation data to have dispatch
refactoring of multi-drone goals
socket Timeouts seem to only lower the timeout threshold