bumped up version number.
added v2.2 section to changelog
added readme for phpunit tests.
Merge pull request #57 from ucsflibtopfstedt/rb2.2

updated changelog, bumped version number
fixed name of default php unit configuration file in the setup instructions.
Merge pull request #58 from ucsflibtopfstedt/rb2.2

fixed name of default php unit configuration file in the setup instructions
updated install and upgrade instructions for v2.2 release.
Merge pull request #59 from ucsflibtopfstedt/rb2.2

updated install and upgrade instructions for v2.2 release.
added missing comma.
Merge pull request #60 from ucsflibtopfstedt/rb2.2

added missing comma.
Merge pull request #62 from ilios/rb2.2

re-integrate release branch 2.2