class_docstr: Dynamically create a new sub-strategy (with common logic) for every pairs trade.
  
  Args:
      * trade_algos ([Algo]): List of algos that defines the sub-strategy behavior
code: def __init__(self, trade_algos):
      super(SetupPairsTrades, self).__init__()
      self.trade_algos = trade_algos
  
imports: from copy import deepcopy
  from future.utils import iteritems
  from datetime import date
  import pandas
  import numpy
  import bt
label_desc: Use image node_id 1 to create a new SetupPairsTrades object from inherited base classes: bt with example: obj = SetupPairsTrades(trade_algos)