implementing more reports
pep8
Merge branch 'master' into reports

Conflicts:
	core/models.py
new layout idea
fix #433 color link of side notes lesson
Merge branch 'master' of github.com:hacklabr/timtec
remove text limitation in lesson description
fix #434
Merge branch 'master' of github.com:hacklabr/timtec
fix #426
now with working backgrounds
fix main-footer and main-nav responsive layout
fix some issues on admin course intro layout
fix change thumbnail and change video buttons on course intro page
Merge remote-tracking branch 'origin/434-stats-page-bug'
Merge branch 'master' into reports
fix organizing lessons responsive layout
fix unfinished merge
firefox get into a infinite recursion with this
cache and when two columns are one over the other don't make them as tall as the page