Small Features to csvimport

[cwood]

Hey,

• added a couple features to the csv import. I added django signals to the app, to allow the model to custom format a row. So if its some row that the app cant figure out we can transform it if we know what it is.
• added appconf to allow the app to be more customizable. Right now I am just using it to manually select which models I am allowing to import from a CSV. But can be used for other settings. If they do not choose it will return to the default behavior.
• I also removed the except all clause. And added it to spcifically to database problems. This way if the user creates a handler and it fails it should return back a relative message. Rather than passing on and not inserting the data.

There is some minor clean up I did. Sorry. Hopefully I didnt hurt blame to much.

Thanks for writing this! Saved me a bunch of time having to make this!

[edcrewe]

Hi,

I am not that keen on adding the django-appconf dependency when it isn't strictly necessary.
But I guess I can remove it again in the future if it bugs me too much :-)

But clearly the pre-import signals to clean up bad data are pretty useful, and thanks for cleaning up
some code. So I have merged this and fixed the tests for overflow errors when given too big numbers.

Thanks,
Ed

[cwood]

Cool thanks a bunch Ed.

I was using django appconf since its a nice and clean way to deal with django settings and it seems like a lot of apps are using it. No worries if you don't want too.