[mod] add .gitignore
[enh] add every models to the admin interface
[mod] for practical reasons, a class can have no professors and no students
[enh] add __unicode__ to professor and student
[enh] add django-bootstrap3 to the project
[enh] add django-extensions to the project
[enh] add django-debug-toolbar to the project
[enh] add django-pdb to the project
[enh] add hamlpy
[enh] start to port django auth mecanism to reuse it for us