Update index.rst

Added unit testing to reference list
added unit-testing.rst to en/reference
Merge branch 'master' of https://github.com/thecodeassassin/docs
Update unit-testing.rst
Update unit-testing.rst
Update unit-testing.rst

Initial version of unit testing documentation
Merge pull request #162 from thecodeassassin/master

Added unit-testing to the reference docs