implements south, fixes #40
implements a new activity type: 'relationship'
change acivities styles
remove html duplication in angular activity templates
add message to show if user answer is correct or wrong
add missing end tag: </strong>
fix unit position count in URL hash
fix 'Skip' and 'Replay Video' buttons in lesson page
show units completed by student in left blocks on lesson page
rename fixture that conflicts with south
fix fatal errors in code formatting
Merge branch 'issue-40-south'
prevent 'undefined' in lesson.js
add new column to Lesson: 'notes' and also, update templates
html5 working
fix mess in js code
require login in api forum
add students and professors groups
defined registration mail text
remove unecessary javascritp