Link issue object direct, no lookup.
Store the issues only in a dict.

Don't store them in a dict and list at the same time.
Cleanup, move most code into functions.
Use logging module for logging
Set log level from config
Rename shadow_board_id to trello_board_id
Github org in config.
Log how long the run took.
Add some docs.
Add option for where to find the config file.