Added function uninstall_all_courses
Merge pull request #223 from swirldev/uninstall_all_courses

Added function uninstall_all_courses
fixed bug in uninstall_all_courses
Merge pull request #224 from swirldev/uninstall_all_courses

fixed bug in uninstall_all_courses
Merge branch 'master' of https://github.com/swirldev/swirl into rename_course_manifest
added ability to explicitly state course title in MANIFEST