Refactored benchmarks to conform to cpp spec

benchmark/bin/pycapnp-carsales

@@ -0,0 +1,10 @@
+#!/usr/bin/env python
+
+from runner import parse_args_simple, run_test
+
+def main():
+    args = parse_args_simple()
+    run_test(name='carsales', suffix='pycapnp', **vars(args))
+
+if __name__ == '__main__':
+    main()