Basic test of tools.generate_seed()
Now we use BIP39 mnemonic module, which has its own tests
Added XprvType, CoinType, reworked Settings
New protobuf binaries
Changed TODO
Implementation of BIP32
Protobuf mapping reflects recent changes in *.proto
'Wallet' refactored to 'Storage' + related changes
Changes related to BIP32
Implemented mnemonic / BIP39
Removed SECP256k1, used curve definition from python-ecdsa