First design integration

Add bootstrap
Add Awesome font
Creation of layout files
Generate Devise Model (db migration)
Login and Sign In links
Update ruby version
Conditional show of login / register links
Merge branch 'feature/add_login_feature' into develop
Add simple_form
Creation of Office model
Creation of Office edit view
Add creation of office at first login
Add link to my office and my profile
Update office model
Merge branch 'feature/add_office_model' into develop
Add patients db migration
Add patient model controller views
Add some rspec files
Adding all missing fields to patient form
Add patient show view
Merge branch 'feature/add_patient_model' into develop
Add practitioner scaffold
Add practitioners to patients
Merge branch 'feature/add_practitioner_model' into develop
Add medical_treatment_types and medical_treatments models
Fix index to user_id
Design of index pages
Design of index layout of medical_treatments