Add a method to detect when parliamentary sessions overlap
Add a method to Place returning child places grouped by PlaceKind

If we want to display child places in a template, it's useful
to have them grouped by PlaceKind.  This method also attempts
to only return child places that existed in the same parliamentary
session as this one.
Return better formatted dates for a ParliamentarySession

The strftime in datetime won't format days-of-the-month
without the leading 0, and doesn't offer 'st', 'th', etc.
suffixes.  Django's DateFormat does, however, so use
that instead, so that we can see dates as:

  5th November 2012

... instead of:

  05 November 2012
Add a get_aspirants method to Place objects

This is largely intended for use from templates - it
will return a structure that represents all aspirants
currently associated with this place,
Incorporate Jedidiah's candidate list page designs

This commit introduces two new pages:

   /place/<PLACE-SLUG>/election/

      A full page description of all the candidates
      associated with a place.

   /place/<PLACE-SLUG>/candidates/

      A sub-page of place that also lists all of the
      associated candidates, but still has the
      usual place page sidebar on the left.  This
      page is also added to the bar of sub-pages
      at the top.
Replace small maps of child places with a textual listing

This commit could have been squashed into the previous one, since
that introduced most of Jed's design.  However, in the future we
may want to revert this and replace the placeholder map images
with real static maps of each child location, so it's useful to
have this as a separate commit.

This commit also bumps the STATIC_GENERATION_NUMBER so that assets
are recached.
Replace the placeholder with a live map on the election page

This commit also bumps the static assets generation number
so that CSS is recached.
Also display coalitions in the candidate list template
Add a note about aspirant list data, only for Kenya

This involves a rearrangement of the templates so that
we can include text at the top of the candidate_lists
page that only applies to Kenya.
Merge branch 'improved-candidate-lists'
Remove example files

These files were introduced by Jedidiah as examples, and
can be removed from master.  (They're incorporated into
the main site.)