v4.3.3

• bugfix: hash is not computed correctly when attached files are used in task file
• bugfix: handling zip/jar files in submission
• bugfix: remove invalid xml characters in response
• bugfix: sharing files between tests
• support for files with same name in task
• return http 400 for detected task errors
• support for JAR files in JUnit tests
• force using django-tinymce version 2.9.0 because version 3.x is incompatible
• https support
• fix versions in requirements.txt
• refactor code