Issue title: Py file not running in Scribus
 Issue body: I can almost guarantee I'm missing a step here.

I've installed Scribus, Python and downloaded Scribus Generator.

Whenever I try to run the script I get an error with no access to any dialogue boxes to load up my csv files. 

I'm not well versed in Python, so if anyone can help me set this up, that would be appreciated.

I'm running a relatively old OS on mac OSX 10.7.5 let me know if this is an issue. Thanks
 Comments: 
 Comment 0: Hello @Jamcob 

I've had several reports of problems to run this script with its graphical interface on Mac, but the [command line interface](https://github.com/berteh/ScribusGenerator/blob/master/README.md#running-scribus-generator-from-the-command-line), on the other hand, works just fine on that OS.

See the README, or our [wiki page](https://github.com/berteh/ScribusGenerator/wiki/Running-Scribus-Generator-from-the-command-line) to get info on who to run the command line version of Scribus Generator.

If you find a way to make the GUI run in Mac OSX that would be great. This point is being discussed in issue #104 
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