WIP - working towards importing from popit
Get popolo importer working with unpaginated output.

The popolo importer now works with unpaginated output like
http://scrapers-ruby.herokuapp.com/organizations
Test popolo importer on a single local file.
Extra requirements for https with SNI.

python-requests needs some extra packages in order to be able to
fetch stuff from an https site with SNI. This is particularly
noticeable now that PopIt uses https.

https://stackoverflow.com/questions/18578439/using-requests-with-tls-doesnt-give-sni-support
Allow setting the instance when importing Popolo data.

In sayit.mysociety.org, we need to be able to choose which
instance to associate speakers with, so allow that as a command
line argument to the sayit_load_speakers management command.
Rename import_people to import_persons for consistency.
Only import persons.

Currently, persons are the only objects from popolo that sayit
uses, and they are imported as speeches.Speaker objects, which
are popolo.Person objects which are subdomain instance aware.

Rather than making instance aware versions of the other Popolo
object types, for the moment we're going to import only the
Persons.
WIP - very basic import people page.

Needs all sorts of improvements, including

1) A success page
2) Better templates and explanation
3) Some links to get in.