Code cleaning - rubocop
Updating gmaps4rails to v2.1.1
Updating dependencies

* reform v0.2.2
* uglifier v2.3.2
* launchy v2.4.2
* guard-rspec v4.1.0
* simple_form v3.0.1
Adding code and driving exam dates for school admins
Fixing code and driving exam dates for school admins
Fixing and completing the instructors management for school admins (ref #21)
Updating Rails and deps