Fixed issue where an invalid destination file name/title would produce an unhelpful error message during file upload.
Added pyfiglet import (requires custom pyfiglet).
Added InsertBigText, InsertBigTodo, InsertBigComment commands (uses pyfiglet to print large ascii text).
Added UploadBatch command (uses the current view to specify filepaths).
Renamed mwclient.Site custom_cookies to inject_cookies
Fixed unnecessary use of list(dict.items()) - I don't think a list is required in these cases.