basic metrics
changes the name of the pilot_group to english
Merge branch 'master' into metricas

Conflicts:
	timtec/settings.py
refactor + tests for metron/analytics
better metrics
Merge branch 'master' into metricas

Conflicts:
	lesson/static/templates/lesson_activity.html
adding metron to requirements
video statistics
Merge branch 'master' into metricas
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
tracking unit completed event
Merge branch 'master' into metricas
s/pilot_course/curso_piloto
merge master