Peer Review PullRequests

[toschdev]

After merging Pull Requests, there have been some outstanding modifications

[] Add bitpay license to the mnemonic.js and wordlist
[] Using "new Buffer()" method shall be avoided and replaced with Buffer.from or Buffer.alloc in mnemonic.js according to: https://nodejs.org/api/buffer.html#buffer_buffer_from_buffer_alloc_and_buffer_allocunsafe
[] Add and refine tests
[] Add coveralls command to package.json and coveralls to gitignore