Change Log for 20150427:
- Add feature to download both private and public image bookmark.
- Fix Issue #70: Update Error code updated and use sys.exit() instead of os._exit().
- Fix Issue #74: add check based on saved filename, old manga data need to be redownloaded to populate the information.
- Add ability to export list of user bookmarks for user with given member_id.
- Pull Request #73: Merge export user bookmarks from prototype27/topic/exportUserBookmarksForUser.
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