Start and end dates can be specified as command line arguments

[RedSpiderMkV]

Start and end dates can now be specified as command line arguments (iso format yyyy-mm-dd).

But it now loses the ability to specify multiple stock symbols in the command line. Seeing as this was just iterating over the list of stock symbols and since its going over a HTTP connection to get daily OHLCV data, I figured performance wasn't going to be critical. As a result, if anyone did want to specify a list of stocks, they could do so as a bash script or python program which simply calls this one for each stock symbol they were interested in.

Any suggestions or thoughts on this? :)