Revert "Support subdomain configuration"

This reverts commit a89c3d5d8abbb41a895d67eaef5b69f42d6a2b28.
Tests for marking success and failue on invoices.
Merge pull request #3 from recurly/uri-for-invoice

Fixing marking invoices as failed or successful
Merge remote-tracking branch 'internal/master'
Basic composer.json
Added simpletest as dev dependency
Use absolute paths to files