Multiple selected table export

[Kreshnik]

Added the possibility to export n selected tables.

[cviebrock]

Cool! A few suggestions before I merge this:

• Please remove the 0 file ... not sure where that came from.
• Please change the file permissions back to 0644 for all the files. Nothing needs to be executable.

Thanks for the contribution!

[Kreshnik]

@cviebrock you're more than welcome. Regarding the issues mentioned;

1. Removed the file called 0 (sorry)
2. I think I set the right permission this time, if not could you do that, please.

[cviebrock]

No problem. I'll clean it up on this end. :)

Thanks!