Removed try catch for api.mixins
Improved TestCaseMixins in app.utils
Improved result calculation method in core app
Added model utils to requirements + sorted dependencies by name
Removed test_requirements (were exactly the same as requirements.txt)
Removed invisible console.log from Utils service + added comments
Added tests for results computation (different chart type)
Continued testing for results
Removed question from results + simplified tests
Added chart_type test for Results (core.tests)
Tested api/question-results
Continued results API tests, boolean and selection typologies tested
Added filtering for results
Resolved conflicts + merged Feature/ResultsCalculation into develop