added functionality to recognise Electrum Mnemonic seeds. These seeds can be encrypted using a similar method to BIP0038 to yield a string that starts with 'SeedE'. bippy can also recognise these encrypted strings and decrypt them. Built in =to the encryption is the same hash check system as bip38 allowing for password verification and user assurance that the decrypted string matches the encrypted string. Also update the unitTests to generate 50 random mnemonics and test encryption/decryption for consitency
merge pull
merged electrum branch into master