* Added denormalized data about semesters, majors and minors in university model
* added function to compute it
* Added function to cron
* new FilterHandler in the front to handle / cache the filtering
* Tweaked map and search components to display the right stuff
* Map now displays in a different color the elements that have been filtered

* Renamed spacilities field to majors
* Fixed bugged in downshift multiple (couldn't add same after delete)
* Deleted useless code in offer

Linked to #31