Make the HTTP API module available to third-party programs as a library.
Update setup.py to take account of the available HTTP library.
Explain how to use the HTTP library.
Export the tests library.
Rename RequestHandler to HttpRequestHandler.
Update README.md with respect to previous commit.
Merge pull request #2 from ProjetPP/export-frontend

Make the HTTP API module available to third-party programs as a library.