get_or_create studentprogress and then sets complete datetime
Merge branch 'master' of github.com:hacklabr/timtec
main navbar responsive
better translations
fluid video size with fixed ratio of 16/9, fixes #77
resposive course.html
fixing conflict
responsive course.html
responsive course.html
Merge branch 'master' of github.com:hacklabr/timtec
responsive signin/signup templates
Merge branch 'master' of github.com:hacklabr/timtec
thumbnail on lessons, fixes #131
design bug
shows error message if passwords didn't match
Merge branch 'master' of github.com:hacklabr/timtec
Merge branch 'master' into metricas

Conflicts:
	core/templates/base.html
	core/templates/course.html
	core/templates/header-authenticated.html
Merge branch 'metricas' of github.com:hacklabr/timtec into metricas