start using import stage classes

Migrate usage to ImportStage classes for some of the functionality.
Ensure all categories are shown, even if there are no pages in those
categories.
migrate media import to MediaImportStage class
migrate template setting into class
Fix JSON/Flare import

use JSON decoder to import flare import.
Fix unicode character issue on titles that came from JSON file.
update to version 1.2.0
Merge pull request #2 from droppedbars/development

Version 1.2.0, supporting JSON imports properly, some refactoring.