Set tokenSupply variable and check against it when minting

[fordN]

Title is self explanatory.

[jaredcosulich]

Right now the setup takes a "initialExpectedTokenSupply". Do we need a separate variable to hold the actual tokenSupply? I'm not sure I understand what the "expected" descriptor is for. Could we just set the tokenSupply in the setup and then check against that when mintBlank is called?

[fordN]

@jaredcosulich yeah I think we just need to set a tokenSupply variable and then check against that when minting. I've updated the issue name accordingly and we can use this to track the work.

[asebesta]

@jaredcosulich @fordN - I should have tagged this one in the latest commit. Once you've had a chance to review I think it can be closed, but let me know. a1b9492