Add version locale list endpoint.

I have rewritten this commit to fix multiple problems with the
addition of locale endpoint. Future changes must be presented in
a pull request for review to avoid such omissions.
 -- David Mason

Fixes:

 - Incremented the minor version since functionality has been added.
 - Added documentation in the README indicating the presence of the
   locale endpoint, and its presumed purpose. The addition of this
   endpoint should not have been committed without being documented
   in the README.
 - There is no locale endpoint in the Zanata REST API documentation, so
   it is assumed this is a prospective endpoint that is being tested.
   I have made this clear in the documentation, and taken the opportunity
   to change the URL to a more sensible one.
 - Fixed indentation in the added JSON resource. Indentation should
   be kept consistent across all mock resources.
Add statistics REST endpoint.

I have rewritten this commit to fix multiple problems with the additon
of the stats endpoint. Future commits should be reviewed in a pull
request to avoid such problems.
 -- David Mason

Fixes:

 - Incremented minor version due to addition of an endpoint.
 - Added documentation in README for the added endpoint.
 - Fixed formatting in added JSON file to make it internally consistent,
   and consistent with other JSON resources.
Add contributions section to README