[#669] Fix member_list call when given valid group name.

Now returns lists of (id, type, capacity) tuples
where type is a string. Previously, type was a
Python class object which could not always be
serialized to JSON in the API controller.
[#669] PEP8
[#669] Raise NotFound if group is not found in member_list.

Allows a proper error to be generated in the API
controller instead of just giving a 500 error.
[#669] Tidy up imports
[#671] Use render_markdown() for custom about page text

Use render_markdown() not markdown_extract() for custom about page text,
so that the full text gets shown not just an extract. Fixes #671.
[#532] remove doc/administrative-datshboard.rst
[#586] Adds error_summary to add stage 3 and tidies up errors after bootstrap upgrade
[#288] Fix for unicode/latin1 .ini values
[#421] Adds tag index page
[#421] Redirects old tag redirect page to new package search with tag
[#421] Fix for checking if we're in legacy templates mode for tests
[#421] Update strings for CKAN 2.0 readyness
[#408] Remove organizations (publisher) code