usage :
- $ note notebooks -> lists available notebooks
- $ note notebook newNotebook -> creates or sets a notebook called newNotebook as the current notebook
- $ note -> displays notes per notebook
- $ note list -> displays a list of notes in a table
- $ note add This is a new note -> creates a new note in the current notebook
- $ note due 1 2016-10-10 -> sets a due date for note 1
- $ note close 1 -> flags note 1 as closed
- $ note delete 1 -> deletes note 1