Milestone Cap Tests

[tspoff]

• Owner should be able to change cap to valid value (>= totalSupply)

• Owner shouldn't be able to change cap to invalid value (< totalSupply)

• Non-owners shouldn't be able to do admin functions ever

• Anyone should be able to read the cap

• Cap changes should emit events

• Should revert buy above cap

• Should allow buy <= cap

• Should allow buy to expected amount after cap change

• Should allow buy after previous sells & correct conditions