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