Add a card definition helper for gaining armor
Implement most of the debug set
Allow setting the health property
Implement keyword arguments to Card.buff()
Implement Hunter's Mark, with tests
Alternate Hunter's Mark design

This is less verbose and weird in the card definition.
Additionally, setting attack to 1 is a more involved process so it
lets us move all that logic to the Buff class.
Implement Humility, with tests

And including a test for Abusive Seargent + Humility.
This is not great, but I believe it is correct.
Implement Equality, with tests

Who doesn't enjoy a good old Pyro-Equality combo?
Implement Aldor Peacekeeper, Spellbreaker and Leokk
Implement Captain's Parrot, Secretkeeper and Shade of Naxxramas
Add .gitignore