updated changelog with entries for v2.2.2 release.
Merge pull request #155 from ucsflibtopfstedt/rb2.2.2

updated changelog with entries for v2.2.2 release.
fixed learning material description display in course summary view. refs #3636
Merge pull request #156 from ucsflibtopfstedt/bug3636

fixed learning material description display in course summary view. refs...
Merge pull request #157 from ilios/rb2.2.2

merged rb2.2.2 into master
updated changelog.
Merge pull request #158 from ucsflibtopfstedt/rb2.2.2

updated changelog.
Merge pull request #159 from ilios/rb2.2.2

merge rb2.2.2 into master