Adding a first attempt at a challenge update script
Merge branch 'develop' of github.com:osmlab/maproulette into develop
Merge branch 'develop' of github.com:osmlab/maproulette into develop

* 'develop' of github.com:osmlab/maproulette:
  Adding a first attempt at a challenge update script
changing error code to 400
adding xmltodict to requirements
adding iso8601 date parser
adding task fixing validation based on timestamp of last changeset and spatial intersect of changeset with task geometries
Addressing #152
adding migration support - does not seem to work with PostGIS, so don't use yet.
remaining bits for fix validation support
Merge branch 'develop' of github.com:osmlab/maproulette into develop

# By Serge Wroclawski
# Via Serge Wroclawski
* 'develop' of github.com:osmlab/maproulette:
  Addressing #152
adding migrations dir to gitignore
making rev geocode noty sticky, fixes #134
modifying docs to include migration info
removing sensitive settings from config file, adding docs to reflect new envvar setup
removing some redundant debug logging
adding debug logging for validation
add more debug logging
add more debug logging
adding time buffer to compensate for different time on osm server