Deal with extra columns

[bilalaslamseattle]

@idan looks like this importer only works for Heroku's billing record tags. For example, my DBR file doesn't have a cloud column, but I have others mapping to our own tags. Do you have plans to support more flexible schemas?

[idan]

@bilalaslamseattle sorry, I'm not really working on this anymore — you're more than welcome to add this stuff, though!