introducing a separate available property on task
UI plumbing for challenge selection and preferences
Merge branch 'master' of github.com:osmlab/maproulette

* 'master' of github.com:osmlab/maproulette:
  Adding a word on contributing
  bringing up to date.
simplifying
speeding up challenge stats
fixtures counter typo
manager Server() spawns debug mode app by default, fixes #99
Merge pull request #100 from osmlab/develop

This fixes #99, #98 and #65 and prepares the UI for settings and challenge selection