Best Practices: Use parameterized script requests

[olivertowers]

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Expected/desired behavior

We should use parameterized script requests, so users are following best practices out of the gate.
eg.

client.submitAsync("g.V().has(prop_a, prop_a_value)", { 'prop_a' : 'city', 'prop_a_value'  : 'Seattle' })