OBSERVER: Magento sometimes fires Observer Events twice.  To fix this I registered
a variable at the end of the sendStockInfo function and checked if it was set at the
start of the sendStockInfo function.  So the function should only execute the code
once per thread
Merge pull request #6 from RhodriOwainDavies/double_update

OBSERVER: Magento sometimes fires Observer Events twice.  To fix this I ...