fixing profile form for mobile devices
fixing the layout of the profile
fixes #215
show login for non enrolled users when they click on units
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
Merge branch 'master' into staging
fix bug that visually erase user progress on lesson page
go to the last unit
Merge branch 'master' into staging