Code reformatting - changed tabs to whitespaces.
oauth script works; add option for expiration
Added requirements.txt
Changed order of arguments for TrelloClient constructor; changed arguments for Board.get_cards; open_cards, closed_cards, etc return all card fields by default (to reduce api calls); update comments
Changed name of util.test_oauth to create_oauth_token; can run
the script from command line
Updated the readme; updated TrelloClient argument changes in the test file