Created gremlin-groovy-test.

Moved all tests from gremlin-groovy.  Created new suites for validating an implementation against gremlin-groovy itself.
Merge branch 'master' of github.com:tinkerpop/tinkerpop3

Conflicts:
	gremlin-groovy-test/src/main/java/com/tinkerpop/gremlin/groovy/jsr223/GremlinGroovyScriptEngineTest.java
	tinkergraph-gremlin/src/main/java/com/tinkerpop/gremlin/tinkergraph/structure/TinkerGraph.java