Merge branch 'master' into mb/behat

...signsubmission-autograde/classes/autograde_webservice.php

...grade/classes/external/autograde_download_credentials.php

...ograde/classes/external/autograde_download_submission.php

...-autograde/classes/external/autograde_upload_feedback.php

moodle-assignsubmission-autograde/css/autograde.css

moodle-assignsubmission-autograde/db/services.php

...bmission-autograde/lang/en/assignsubmission_autograde.php

moodle-assignsubmission-autograde/lib.php

moodle-assignsubmission-autograde/locallib.php

moodle-assignsubmission-autograde/settings.php

moodle-assignsubmission-autograde/version.php

moodle-assignsubmission-autograding/version.php

moodle-grading-service/pom.xml

...cs107/grading/moodle/MoodleGradingServiceApplication.java

...s107/grading/moodle/api/v1/auth/ApiKeyAuthentication.java

...moodle/api/v1/auth/filter/ApiKeyAuthenticationFilter.java

...odle/api/v1/auth/manager/ApiKeyAuthenticationManager.java

...le/api/v1/auth/provider/ApiKeyAuthenticationProvider.java

.../cs107/grading/moodle/api/v1/config/KubernetesConfig.java

...fl/cs107/grading/moodle/api/v1/config/SecurityConfig.java