remove ReqType CANCEL_ORDER, to be reimplemented
remove CancelOrderTodo
remove class PacketCancelOrder
remove class CancelOrder
re-implement cancel orders

Instead of request type="cancel_order" we are now using
<request type="place_order">
  <query orderId="1234">
    <order action="CANCEL" totalQuantity="0"/>
  </query>
</request>
update ChangeLog
Merge branch 'place_order_cancel'

* place_order_cancel:
  update ChangeLog
  re-implement cancel orders
  remove class CancelOrder
  remove class PacketCancelOrder
  remove CancelOrderTodo
  remove ReqType CANCEL_ORDER, to be reimplemented
fix, parsing comboLegs from xml failed
handle contract_details error 321 "Error validating request:-"
style, correct switch/case indentations
Merge branch 'con_details_err'

* con_details_err:
  style, correct switch/case indentations
  handle contract_details error 321 "Error validating request:-"
import travis yaml controller (continuous integration)
see, http://travis-ci.org
travis, sudo install twsapi
travis, don't escape newlines
travis, leave twsapi dir after building it
Merge branch 'next'

* next:
  travis, leave twsapi dir after building it
  travis, don't escape newlines
  travis, sudo install twsapi
  import travis yaml controller (continuous integration) see, http://travis-ci.org
hotfix, IB renamed their datafarms