Added logic to blacklist all punycode domains. This will help tackle phishing in a big way as we are seeing a lot of IDN homograph attack domains on places such as coinbase, poloniex, mycrypto, and myetherwallet. This means you won't have to worry so much about checking the domain carefully for characters, i.e.: mycrypto.com or mycrypø̄.com)
This block is toggable, but by default it's turned on.
Adjusted edit distance for myetherwallet.com from 7 to 5 to prevent a lot of false-positives.