proxy_as lets you move from query to queryproxy
change default `result` identifier behavior, `optional` shortcut, general refactoring of related methods
Travis should test against neo4j 2.2.0
adjust test to pass in 2.1.6 and 2.2.0
Merge pull request #638 from neo4jrb/proxy_as_and_optional

From Query back to Query Proxy, OPTIONAL MATCH in QP