Py-trello-api

Fix timezone problem with tz aware datetime
null/empty check for actions (closes 266)
provide access to the raw card json

Add ability to pass custom query parameters to get_cards
fix 256 can't set attribute errror

Add check and fix for python3 unicode assertion
Add warning that running tests will delete cards
trelloclient: allow to customize cards_limit
more card API consistency
fixed customFields on cards
added default_lists as parameter to add_board
Add lazy loading for card.customFields
Add function for accessing new/existing custom fields of a card by name

Modifies Cards.from_json to not require customFieldItems

Fixes Issue 247 KeyError: 'customFieldItems'

Delete star string format hotfix for python 2.7 compatability