Fix examples, I think
I had accidentally switched the names of scriptSig and pubKey everywhere!
Clarify OP_EQUALVERIFY wording
Add an unspendable transaction example

Added OP_RETURN
This required fixing OP_EQUALVERIFY logic
Add tooltips for example transactions

Add document.ready wrapping all JS
Add caveat about OP_CHECKSIG being mocked out
Add a hash puzzle example

Fix OP_PUSH to include 0x01
Reword some examples