Cernservicexml

- Relaxes Requests library version requirement from v2.3 to v1.1 to support
CERN SLC6/CentOS 7 distributions. Note, Python 3.4 requires Requests v2+.
- Adds Travis test matrix to test multiple versions of the Requests library.
- Standardises software name (CERNServiceXML) and package name (cernservicexml)
following usual inveniosoftware practices.
- Fixes reST headline formatting in `RELEASE-NOTES.rst`.

- Adds support for service status parameter in ``ServiceDocument``.
- Deprecates use of service availability percentage in ``ServiceDocument``.
Please use service status parameter instead.
- Changes documentation theme to the standard non-Flask RTD one.
- Initial release of Docker configuration suitable for local developments.
`docker-compose build` rebuilds the image, `docker-compose run --rm web
python setup.py test` runs the test suite.

- Adds support for long (Python 2) integers.

- Fixes issues with POST request for sending the service XML to XSLS.
- Adds doctests to ensure documentation examples works.
- Adds XML validation tests according to XSD Schema.

- Initial public release.