Merge branch '465-auth-validate' into 20160928-chain-refactor

# Conflicts:
#	libraries/app/database_api.cpp
#	libraries/chain/database.cpp
#	libraries/plugins/follow/follow_evaluators.cpp
#	libraries/protocol/include/steemit/protocol/config.hpp
#	libraries/protocol/include/steemit/protocol/steem_operations.hpp