Adding OrderedDict.py to utensils, to run ImSimRecipes with python 2.6.

Dear Jim, 
this is a pull request to resolve collections.OrderedDict import issue on a machine with python 2.6. 
Thank you, cheers, 
Jarka


```
Traceback (most recent call last):
  File \"<stdin>\", line 1, in <module>
  File \"/home/tmp/Panda_Pilot_15657_1400602286/PandaJob_2176_1400602411/ImageSimulationRecipes/python/recipes/__init__.py\", line 2, in <module>
    from stargal import stargal
  File \"/home/tmp/Panda_Pilot_15657_1400602286/PandaJob_2176_1400602411/ImageSimulationRecipes/python/recipes/stargal.py\", line 24, in <module>
    import utensils
  File \"/home/tmp/Panda_Pilot_15657_1400602286/PandaJob_2176_1400602411/ImageSimulationRecipes/python/utensils/__init__.py\", line 6, in <module>
    from knife_kit import PhosimParameters
  File \"/home/tmp/Panda_Pilot_15657_1400602286/PandaJob_2176_1400602411/ImageSimulationRecipes/python/utensils/knife_kit.py\", line 5, in <module>
    from collections import OrderedDict
ImportError: cannot import name OrderedDict 
```