Add content store test helpers for PUTing data
Use more specific URL matcher
Remove unnecessary test
Merge pull request #161 from alphagov/content-store-put

Add content-store test helpers for PUTing data
Bump version to 10.17.0
Add to router-api test helpers.

* Add helper to stub out all registration.
* modify existing helpers to return the WebMock stub objects.
Router client no longer commits routes by default.

This reverses the sense of the option parameter to allow optionally
requesting to commit as well.  This is a breaking change, and will be
released as a major version bump.

The reason for this is that everywhere we use this at the moment, we're
registering more than one route, and therefore using the skip_commit
option.  It therefore makes sense to make this behaviour the default.