Add multiple cursors
Add Editor's multiple cursors tests
Add removeMergedCursor to Editor & Small refactoring
Call removeMergedCursors when cursors have moved
Small refactoring for Editor & Cursor
Use prepend instead of append on cursors' list (waaaayyy better performance)
Update test assert (rebased on master)
Some fix styling
Fix typo
Add forgotten return type
Merge pull request #7 from Matthieu-Riou/multipleCursor

Multiple cursors