Support full opcode set

[JornC]

The current opcodes that have been implemented are those that exist in the most common transactions:

P2SH, P2PKH, P2PK and OP_RETURN

With complete disregard of the P2SH's redeemScript, these encompass nearly all transactions in the blockchain, but especially if P2SH is fully supported by this explorer, all the other opcodes become more relevant.

Implement all of them.

[mrkent]

+1. I've been looking for an alternative to webbtc, and I think this might be it.