Change main bar's background colour.
Create 'analysis' model.

rails g model analysis problem_existence:boolean
desired_characteristics:array undesired_characteristics:array
current_situation_rate:integer
Create analyses controller.

rails g controller analyses index show new edit create update destroy
Add analyses to the routes file.
Create basic actions in analyses_controller.
Move tabs' content to analysis (view part).
Merge branch 'create-analyses'
Get rid of cause-related files.
Tidy up code a bit + small refactoring (DRY).
Merge branch 'get-rid-of-causes'