Hyperledger Fabric SDK for Node.js fabric-client API

* **fabric-client**:
  * create a new channel -> createChannel
  * send channel information to a peer to join -> joinChannel
  * install chaincode on a peer -> installChaincode
  * instantiate chaincode in a channel, two steps: [propose] and [transact] ->sendInstantiateProposal/sendTransaction
  * submitting a transaction, two steps: [propose] and [transact] -> sendTransactionProposal/sendTransaction
  * query a chaincode for the latest application state -> queryByChaincode
  * query channel height -> queryInfo
  * query  block-by-number -> queryBlock
  * query  block-by-hash -> queryBlockByHash
  * query  all channels that a peer is part of -> queryChannels
  * query  all installed chaincodes in a peer -> queryInstalledChaincodes
  * query  all instantiated chaincodes in a channel -> queryInstantiatedChaincodes
  * query  transaction-by-id -> queryTransaction
  * query  channel configuration data -> getChannelConfig
  * connect to a peer's event stream -> connect
  * listen on [block events] -> registerBlockEvent
  * listen on [transactions events] -> registerTxEvent
  * listen on [custom events] -> registerChaincodeEvent
  * serializable [User]{@link User} object with signing capabilities
  * hierarchical configuration -> getConfigSetting
  * logging utility -> setLogger
  * pluggable [CryptoSuite] -> api.CryptoSuite
  * Software-based ECDSA -> CryptoSuite_ECDSA_AES
  * PKCS#11-compliant ECDSA] -> CryptoSuite_PKCS11
  * pluggable [State Store] -> api.KeyValueStore
  * File-based store  ->  FileKeyValueStore}
  * CouchDB-base store -> CouchDBKeyValueStore
  * customizable [Crypto Key Store] -> CryptoKeyStore