Merge branch 'typescript_eslint' into v3.1.0

ExerciseChecker/.env.vault

ExerciseChecker/.eslintignore

ExerciseChecker/.eslintrc.json

ExerciseChecker/.gitlab-ci/03_stages.yml

ExerciseChecker/.gitlab-ci/04_stageCodeQuality.yml

ExerciseChecker/.gitlab-ci/05_stageTest.yml

ExerciseChecker/.gitlab-ci/06_stageBuild.yml

ExerciseChecker/.gitlab-ci/07_stageClean.yml

ExerciseChecker/.gitlab-ci/08_stageUpload.yml

ExerciseChecker/.gitlab-ci/09_stageRelease.yml

ExerciseChecker/.idea/jetbrainsConfiguration

ExerciseChecker/.idea/jsLinters/eslint.xml

ExerciseChecker/package-lock.json

ExerciseChecker/package.json

ExerciseChecker/src/app.ts

ExerciseChecker/src/managers/DojoBackendManager.ts

ExerciseChecker/src/managers/HttpManager.ts

ExerciseChecker/src/shared