Create Get_Avg_Vol_Stocks

This is code to get the avg daily volume of up to 15,000+ stocks from yahoo finance, it does this by pushing 200 stocks through the API at a time. 
A text file with the 15k+ stocks is in another file, along with a dated list of volumes.  Note:  to get parameters other than avg daily volume on the stocks, just change the value of f, which is currently f = 'a2'.  A list of codes can be found at www.jarloo.com/yahoo_finance/