Spec changing for tests
 Model, controller and all changes to cancancan
Gemfile and test helper
 Changing spec redirect
Modifying navbar according to role
validate phases inside period
Validate phase inside period
changing layout
Starting the construction of the composition between Phases and Evaluation Period
Fixing helper methods for creating the composition between Phases and Evaluation Period
Creating validation for overlapping phases
Commenting validation to merge with working_tree (temporary)
Fixing tests with validate