Fix CexIO Trade History
Fix VoS trade history argument handling.
fix VoS args handling again.
Implement public trade history for Justcoin.
Add last trade id to ItBit
Merge pull request #480 from jamespedwards42/develop

Implement Public Trade History For Justcoin.
[Cryptonit] Polling marketdata
Change sorting order for hitbtc
Merge pull request #482 from jheusser/fix_change_sort_hitbtc

Hitbtc: change sorting order for public trades
Add implementation of BtcTrade API.