Add networks for for Litecoin, Bitcoin Cash, Zcoin, QTUM

[davispuh]

There is a fork money-tree-extended (nikharR/money-tree).
Only thing it does it adds additional networks for few coin forks:

• Litecoin (LTC)
• Bitcoin Cash (BCH)
• Zcoin (now called FIRO)
• QTUM

I think it's unreasonable that every coin fork would also need some fork of money-tree.
I think money-tree should support popular coin forks by default so people can easily use it for other coins aswell.

For example with this PR this would automatically work:

network = :litecoin
master = MoneyTree::Master.new(seed_hex: seed)

masterPrivateKey = master.private_key.to_s(network: network)
rootKey = master.node_for_path('m').to_bip32(:private, network: network)

address = master.node_for_path(path).to_address(network: network)

In this PR I included these commits from money-tree-extended fork:

• nikharR@5e5ddae
• nikharR@0b343ca