Revert "Removed Board.open() and List.open() for the pull request"
Revert "Removed Board.open() and List.open() for the pull request"

This reverts commit 016dcc18f0696d2e4c65af9519222ebf86b9e463.

ntrepid8/py-trello,gchp/py-trello,Wooble/py-trello,mehdy/py-trello,sarumont/py-trello,nMustaki/py-trello