Test to find undocumented action functions
Documentation for member_roles_list
Fix import for asbool
[#792] Fix auth function
Merge branch 'master' into 646-undocumented-action-functions

Conflicts:
	ckan/logic/action/create.py
	ckan/tests/logic/test_action.py
Document group_member_create
Added documentation for group_member_delete

Updated documentation for group_member_create
[#709] Document pckage_relationships_list()
Merge branch 'master' into 646-undocumented-action-functions
Add docstrings for two more functions

* Add docstring for organization_member-create.
* Add doctstring for organization_member_delete.
Remove tests for docstrings
Remove fixed functions from the blacklist
resource_update: use package_update like resource_create does
Merge branch 'master' into 792-create-dataset-auth-improvement
[#715] Checks if resource can be previewed and that changes the UX

Adds new helper function to check if a resource can be previewed and adds it to
the templates.
@auth_sysadmins_check auth function decorator

Conflicts:
	ckan/new_authz.py

    trivial
[#792] Fix package_create auth function for sysadmins
[#792] Fix some tests now auth changes made
[#1013] Improve performance when new_activities not needed
[#646] Add type. Fix username param

* Add type to all the function parameters.
* Refer to function with `func`.
* Fix _group_or_org_member_delete to use username instead of user_id
  so it's consistent with the other functions.