Refactor BoundColumn attributes to allow override of class names. #349

[graup]

Related issue: #349

First proposal, refactoring the BoundColumn code to allow override of the class names. For now this preserves the old behaviour of adding the column's name by default. See the test for how it can be overriddden. In a future version we could just swap the two get_class_name versions.

I'm not entirely happy with this, though. I think it would be better if users didn't have to touch the BoundColumn internals. I just couldn't think of a better place.

Maybe instead have a overridable get_column_class_name(self, bound_column) method directly on the table which would be called from BoundColumn, passing itself?

[jieter]

@graup thanks for opening the PR!

I agree users should not have to touch BoundColumn internals, the bound_column_class addition to table's class Meta is not a very clear API. can you try your latest suggestion, maybe in a different PR so we can compare the two?

[jieter]

Decided to use the other option provided in #370