Deck.remove() removes the wrong card.

[Jo-Erlend Schinstad]

>>> from deck import Deck, Card
>>> testdeck = Deck()
>>> cards = testdeck.get_cards_by_name("s:234 c:5")
>>> for card in cards:
... print("Removing {0}".format(card))
...
Removing ♠2
Removing ♠3
Removing ♠4
Removing ♣5
>>> for card in cards:
... testdeck.remove(card)

>>> for card in cards:
... print("{0} in testdeck: {1}".format(card, card in testdeck))
...
♠2 in testdeck: False
♠3 in testdeck: False
♠4 in testdeck: True
♣5 in testdeck: True
>>> print(len(testdeck))
48
>>> testdeck.sort(by_suit=True)
>>> for card in testdeck:
... print card
...
♣2
♣3
♣4
♣5 <-- should've been removed.
♣6
♣7
♣8
♣9
♣10
♣J
♣Q
♣K
♣A
♦2
♦3
        <-- should NOT have been removed
♦5
♦6
♦7
♦8
♦9
♦10
♦J
♦Q
♦K
♦A
♥2
♥3
♥4
        <--- Should NOT have been removed.
♥6
♥7
♥8
♥9
♥10
♥J
♥Q
♥K
♥A
♠4 <-- Should've been removed
♠5
♠6
♠7
♠8
♠9
♠10
♠J
♠Q
♠K
♠A
>>>