Add ckan_api column to User table
Add ckan_api to the update form
Show the exporter to Datahub.io
CKAN module and class for exporting data
DataStore fields, aliases and indexes added.
Create DataStores added.
Use primary_key to allow upserts
Push data to the DataStore.
Export task and task_runs to a CKAN server
PEP-8
CKAN settings
Minor fixes for CKAN_URL

This commit remove the CKAN_API config var, as it is now configured in the Ckan constructur. Additionally, the current_user.ckan_api error has been fixed when the user is anonymous.
Only show the CKAN exporter option to authenticated users.
Unit Tests for CKAN module
Use try except to manage CKAN errors
return Exceptions instead of JSON with the formatted error
Handle the Exceptions as flash messages
Add beautifulsoup4 as a requirement
Merge pull request #481 from PyBossa/issue-478-ckan

Issue 478 ckan