Basic controller to accept a court

Includes a couple of tests for the happy path of a named court. For now,
we're only planning to do the minimum amount of validation necessary to
send the court to the content store.
Fix the capitalisation of the app's top module
Send a court to the publishing API

This is as basic as humanly possible while still sending something valid
to the publishing API (lumping everything into the controller rather
than adding a separate model layer, for example), but it works.
Stop the tests making real HTTP requests

That would be bad.
Require a slug to be present in the request JSON

Return 422 if it isn't present. We need the slug to construct the
base_path for the publishing API.
Require a name to be present in the request JSON

The content-store validates that title is present for renderable content.
Return 400 if the request JSON is unparseable
Include the published URL in the response

We're explicitly calling to_s on the published URL because Rails
serializes it as the hash of its elements otherwise.
Parse request body in a before filter
Use symbols in hash keys
Use single quotes everywhere possible in our code

ie everywhere except where we're using string interpolation, or raw
JSON, or an occasional spec description which includes quotes.

* WARNING: personal opinions may be present*

I find single quotes easier to read in general, and like to be able to
see at a glance from the quotes whether or not a particular string uses
interpolation. We've been following this rule in Transition for some time,
only using double quotes where necessary.

This does contradict our style guide, which comes down in favour of
double quotes, or at least not using both near each other:

    https://github.com/alphagov/styleguides/blob/f88150845037cae27f5c23d666e43f1081fc96f7/ruby.md#strings
Use the have_http_status matcher instead of be_

This has the advantage of being more explicit in the tests, and also
gives more informative output for test failures: you see the actual
value, rather than just 'false is not true'-type errors.
Merge pull request #8 from alphagov/court-publishing

Court publishing