Issue #19: Adds unit test string_decode_invalid_escape_sequence.
Issue #19: Adds unit test string_decode_invalid_escape_sequence.

The issue wasn't a real one -- it worked the whole time, but I added a test for it anyway.

respu/json-voorhees,tgockel/json-voorhees,tgockel/json-voorhees,venediktov/json-voorhees,venediktov/json-voorhees,respu/json-voorhees