[RELEASE] FlashGot + native pyLoad support

I took the freedom and added pyLoad as an own download manager to FlashGot.

Feel free to download FlashGot + pyLoad support version 1.5.3 from:
http://flashgot-pgoeri.googlecode.com/files/flashgot-1.5.3pgoeri.xpi

If pyLoad is running on your local machine, it will detect it automatically.
If pyLoad is running on another host (e.g. NAS), you will need to change the URL once in the page about:config in firefox:

flashgot.dmsopts.pyLoad.url
=http://<ip or hostname>:9666/flashgot

DO NOT add an slash at the end!

@GM
I hope you apply my changes to the next official release. Here's an unified diff:
http://flashgot-pgoeri.googlecode.com/files/pyload_pgoeri.diff