Fixes #93. Show @levels.size-1 so level 0 is not counted.
Merge pull request #94 from fonglh/issue-93

Fixes #93. Show @levels.size-1 so level 0 is not counted.
Fix uninitialized constant Training in _tabs
Merge pull request #95 from jsyeo/jsyeo-fix-uninit-const

Fix uninitialized constant Training in _tabs
fix unable to comment due to cancan authorise problem
Merge branch 'development' of github.com:Coursemology/coursemology.org into Deploy