fixing profile form for mobile devices
fixing the layout of the profile
fixing signin/signup modal's form
Merge branch 'issue199'
Merge branch 'issue208'
Merge branch 'issue213'
new requirements all from released software \o/
make clean rule
fix back and forward buttons, this bug prevents use to back in last activity using back button in browser
fix bug that visually erase user progress on lesson page
Merge branch 'master' into admin

Conflicts:
	lesson/templates/lesson.html