Show warning when closing tab / selecting article in case of unsaved codings. Fixes #69.
Set status to 'in progress' while saving if current status is 'not started'. Fixes #60.
Increased dropdown size to 100 items (see #55).
Include 'medium' in CodedArticle overview (fixes #54)
Added message confirming saved codings, fixed bug causing 'last article reached' to not be shown. Fixes #59.