Override place_detail template for South Africa
Add a placeholder for the SA place detail sidebar
Override place_base template for south africa

It seems that overriding the place_detail template won't be enough, as
we need to have some shared layout between the subpages of places.
Put place tabs into their own partial
Move shared place logic into place_base template for SA

This makes the actual place subpage templates much slimmer and reduces
duplication between them.
Remove disqus comments from place detail page

Part of #856
Change place to constituency office on place pages
Fix indentation of place_detail template
Add custom place detail view for SA

We're splitting up the types of people in the place overview into 3
separate lists, so we're overriding the url and view to allow us to
change the context.
Split national assembly members for place into separate list
Fix display of national assembly members on place detail
Add ncop and other people to place detail context

This allows us to properly split into 3 sections on the place pages.
There isn't currently the data for Members of the Provincial Legislature
which #780 mentioned, so we're just splitting into "Other people" for
the time being.
Output people counts and lists on places page
Don't show the people tab on place pages

This removes the duplication between the overview tab and the people
tab, as requested in #780
Make the place people lists toggleable

As requested in #780
Document why the place detail view is being overridden
Add active_class template tag

This, as the name suggests, adds an active class to links if the request
passed in matches the named route and arguments passed in.
Add active class to current nav item on place pages
Add tests for active_class templatetag
Move place tabs inside subcontent area

This means that the tabs aren't automatically added to place subpages,
so they have to be included manually inside the subcontent block to
render them. So, i.e., on the Constituency Offices tab the tabs will
need to be manually included there.