Added enketo edit data endpoint
GM Refactored enketo datapoint and updated the API documentation
GM: Updated enketo documentation with return url parameter
GM: Store strings as constants
Added enketo edit data endpoint
GM Refactored enketo datapoint and updated the API documentation
GM: Updated enketo documentation with return url parameter
GM: Store strings as constants
Merge branch 'enketo_edit_url' of github.com:onaio/onadata into enketo_edit_url
GM: Refactored _get_form_url functionality
GM: Added Enketo Exception
Merge branch 'master' into enketo_edit_url
PLD: prefix server and user for testing with TEST_
Merge pull request #393 from onaio/enketo_edit_url

Added enketo edit data endpoint
RR: add require-auth field to xform model
RR:  list orgs for which user has permissions, closes #398
RR: hide private forms and prevent submission from non-owners
RR: test submission to a private form by non-owner is forbidden.
RR: fix pep8
RR: revert response to bad request