Modified the save document method of the document manager to return the new document in case the file was saved as a new document.
Added notifications for when a document was edited and saved.
Modified the Text Editor View to work with the document manager.
Notifications correctly reflect changes in multiple text editors linked to the same document. Syntax coloring is dine manually for each of the inactive tabs where the change was not made. This is done because the notification for syntax highlighting was not being invoked.
Added a casting to the "textDocumentDidChange: method to remove a warning that occurred while compiling.