nextUp now closes the dialog box
First crack at a dialog creator
Renamed table "users" to "osmusers
Renamed "actions" in Challenge module to done_dialog, and added logic in client to support it
Added "checkout" function to task (not yet functional)
Adding Showdown to address #42
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Adding Showdown to address #42
  Renamed table "users" to "osmusers Renamed "actions" in Challenge module to done_dialog, and added logic in client to support it Added "checkout" function to task (not yet functional)
  First crack at a dialog creator
  nextUp now closes the dialog box
Merge branch 'master' of git://github.com/mvexel/maproulette

* 'master' of git://github.com/mvexel/maproulette:
  Update README.md