Initial commit, changes below:

- added models for client isntructor admin each with own devise
- added google maps gem
- added admin namspace to routes, all admin controllers should be put in it
- added base controller for admin with authentication requirement, all admin controllers shoud inherit it
- added cities model/controller/views to handle cities we will have instructors in
- added instructors controller to admin
- default locale set to bg
- devise views copied to views/devise