MATLAB xUnit 4.0.1

Update README.md

Removing some superfluous backticks.

Adding additional sections to readme

Versioning, Contributing, and License

Nicer comments

New upstream version 3.1

http://www.mathworks.com/matlabcentral/fileexchange/22846-matlab-xunit-test-framework

add more tests

Initial commit from version 3.0.2 of xUnit, from File Exchange