Add BitHumb

[deepbrook]

Url:
https://www.bithumb.com/u1/US127

Tasks:

• Tests
• REST Wrapper
• Pair Formatter
• Interface

[ajeep8]

@nlsdfnbch I had added pair/ticker/orderbook/wallet of CoinOne/BitHumb/CEX.IO in my fork dev branch

[firepol]

@ajeep8 what are you waiting to submit a PR? ;)

[ajeep8]

@firepol I just copy&modify the pair/ticker/orderbook/wallet of CoinOne/BitHumb/CEX.IO/CoinNest/Exmo/Gate.IO, but other methods are neither completed nor removed, so it seem unsuitable for submit yet. I will complete or remove the uncompleted method when I have time.