support azurerm backend storage for tfstate files

[jmacnett]

A number of the terraform stacks I work with are configured with azurerm backend values, which doesn't currently appear to be supported, based on documentation and examples.

I'd like to request support for azurerm-backed terraform be built in; there's already support for s3 at this point, so this seems like a logical step, and equivalent functionality would be a boon for those of us working in azure storage accounts & containers for tfstate management.

Thanks.