[#1126] First run at new homepage modules core extension
[#1126] Added config for sysadmin area
[#1126] Simplified snippets and added temporary homepage layour variable
[#1126] Simplified templates for new homepage modules
[#1126] Brings featured groups/orgs from from be06121 into this branch

It's just a slightly edited version of
https://github.com/okfn/ckan/blob/be06121/ckanext/featured/plugin.py as now
the helpers are returning data and not data+html.
add stats and make homepage_style config option
[#1126] Added stats and new layouts 2 and 3 for homepage
Merged master
[#1126] Removed  because it's not used
[1126] move homepage modules into core and fix tests
[#1126] Removed index_base.html and changed layouts into snippets
[#1126] PEP8 and fix typo
Merge pull request #1126 from okfn/1126-homepage-module

Homepage modules