dl_bt_dukascopy.py: Support for downloading commodities and stocks. [$20 awarded]

[kenorb]

Currently it's downloading like:

http://www.dukascopy.com/datafeed/E_YHOO/2012/02/04/22h_ticks.bi5

which does not exist. So the logic needs to be improved after this change: 8731410af4c78977afe00ce08628b82741bec086

Example run:

./dl_bt_dukascopy -p E_YHOO

Check dev branch for the right commodities and stocks mapping.

This shouldn't break existing downloading of currency pairs.

Check existing dl_bt_dukascopy.php to compare the logic.

Please check this page for details (manual download).

Est. 1-2h

--- The **[$20 bounty](https://www.bountysource.com/issues/31083586-dl_bt_dukascopy-py-support-for-downloading-commodities-and-stocks?utm_campaign=plugin&utm_content=tracker%2F20487492&utm_medium=issues&utm_source=github)** on this issue has been claimed at [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F20487492&utm_medium=issues&utm_source=github).

[kenorb]

Fixed in PR #67