GrapheneUtils.java: easily verify messages passed between javascript <-> java using a graphene keypair
for an in-depth explanation of this class, please refer to the following post:
Link: HOWTO Verify Messages Between JavaScript and Java with a Graphene KeyPair (via utopian-io)
Link: HOWTO Verify EOS Messages Between JavaScript and Java with a Graphene KeyPair
steem.min.js: extended version of steemjs javascript library exposes ecc, memo, buffer classes