Rbitcoin.plot: no visible global function definition for ‘dev.off’
Rbitcoin.plot.order_book: no visible global function definition for
  ‘plot’
Rbitcoin.plot.order_book: no visible global function definition for
  ‘lines’
Rbitcoin.plot.order_book: no visible global function definition for
  ‘mtext’
Rbitcoin.plot.order_book: no visible global function definition for
  ‘grid’
Rbitcoin.plot.trades: no visible global function definition for ‘plot’
Rbitcoin.plot.trades: no visible global function definition for ‘mtext’
Rbitcoin.plot.trades: no visible global function definition for ‘grid’
Rbitcoin.plot.wallet: no visible global function definition for ‘par’
Rbitcoin.plot.wallet : case.legend: no visible global function
  definition for ‘dev.interactive’
Rbitcoin.plot.wallet : case.legend: no visible global function
  definition for ‘legend’
Rbitcoin.plot.wallet : case.legend: no visible global function
  definition for ‘dev.cur’
Rbitcoin.plot.wallet: no visible global function definition for ‘plot’
Rbitcoin.plot.wallet: no visible global function definition for
  ‘barplot’
Rbitcoin.plot.wallet: no visible global function definition for ‘lines’
Rbitcoin.plot.wallet: no visible global function definition for ‘title’
Rbitcoin.plot.wallet: no visible global function definition for ‘mtext’
blockchain.api.query: no visible global function definition for
  ‘packageVersion’
get_rate: no visible global function definition for ‘packageVersion’
market.api.process: no visible global function definition for ‘data’
market.api.process: no visible global function definition for
  ‘packageVersion’
market.api.query.bitmarket: no visible global function definition for
  ‘packageVersion’
market.api.query.bitstamp: no visible global function definition for
  ‘packageVersion’
market.api.query.btce: no visible global function definition for
  ‘packageVersion’
market.api.query.kraken: no visible global function definition for
  ‘packageVersion’
market.api.query.mtgox: no visible global function definition for
  ‘packageVersion’
wallet_manager: no visible binding for global variable ‘timestamp’
wallet_manager : wallet_source.market: no visible binding for global
  variable ‘timestamp’
wallet_manager : wallet_source.blockchain: no visible binding for
  global variable ‘timestamp’
wallet_value: no visible global function definition for ‘data’
wallet_value: no visible global function definition for ‘head’
wallet_value: no visible global function definition for ‘write.table’
wallet_value: no visible binding for global variable ‘timestamp’
Undefined global functions or variables:
  barplot data dev.cur dev.interactive dev.off grid head legend lines
  mtext packageVersion par plot timestamp title write.table
Consider adding
  importFrom("grDevices", "dev.cur", "dev.interactive", "dev.off")
  importFrom("graphics", "barplot", "grid", "legend", "lines", "mtext",
             "par", "plot", "title")
  importFrom("utils", "data", "head", "packageVersion", "timestamp",
             "write.table")
to your NAMESPACE file.