Expose ECKey from main module file
Add crypto-js utils back, as they were on the original bitcoinjs-lib
Bugfix (was not loading Binary)
Fix numToVarInt to use little endian

See https://github.com/bitcoinjs/bitcoinjs-lib/issues/14
Uses the code suggested by vbuterin (on Github's issue),
and added an optional argument for using big endian encoding
(needed for message.js)
Changed back to having transaction hashes stored as base64 and not hex (originally modified by bitfloor, probably to match the way it comes from their API)