IRISHUB-359: add rest apis of gov and keys for lcd

IRISHUB-359: add rest apis of stake and slashing for lcd

Pull code from feature branch to develop

…d be iris-atto, but it turn out to be iris

Usage:
  iris [command]

Available Commands:
  init             Initialize genesis config, priv-validator file, and p2p-node file
  start            Run the full node
  testnet          Initialize files for a Gaiad testnet
  unsafe_reset_all Reset blockchain database, priv_validator.json file, and the logger

  tendermint       Tendermint subcommands
  export           Export state to JSON

  version          Show executable binary version
  monitor          irishub monitor
  help             Help about any command

Flags:
  -h, --help               help for iris
      --home string        directory for config and data (default "/home/lhy/.iris")
      --log_level string   Log level (default "main:info,state:info,*:error")
      --trace              print out full stack trace on errors

Use "iris [command] --help" for more information about a command.

…rs/{addr}

…shub into feature/lcd-dev-5

…andlerFn