change content class to main-content, change top illustration names
course intro page layout
delete glyphicons because we are using font awesome
lessons page layout
signup link in login header menu
created hacklab_theme for django templates
uniform lesson page layout for forum, course materials and notes
create hacklab_theme for /static and rename less files
authenticated user menu in header
fix my notes page
course links in home
upcoming courses and courses thumbnail
twitter api for timtec and embeded twitter timeline
fix admin course list
professosrs messages are saved and sent