New Features

Assignments can now include external assets such as images, dataset files and source files with examples. These assets must be stored in a folder named public within the root folder. In the instructions.md file, assets should be referenced using relative paths (ex: ![Exercício 1](public/exercicio1.png))

Enhancements

Significant reduction of the war file, from ~180 Mb to ~140 Mb.
Better handling of zip submissions which include write-protected folders. This implied using a new library - instead of zip4j, it now uses commons-compress
Improved encoding detection by using a new library: juniversalchardet. This should fix some ocasional errors parsing the AUTHORS.txt file.
Expired personal tokens draw attention to this fact by showing a red "Expired" label
API responds with a specific message when the token is expired to allow third-parties to give this information to the user
Allow concurrent submissions, configurable through the admin dashboard
Improve student api for submissions - it now responds with an ACCEPTED http code (202) while the submission is in the validation process
Increase the max length of the git repository url
Add support for tables in the instructions.md file (github flavored markdown)