add type parameters to make javac happy

project failed to compile with java 1.8.0_20, emitting the following errors...

Information:Using javac 1.8.0_20-ea to compile java sources

Users/jason/IdeaProjects/tinkerpop3/gremlin-test/src/main/java/com/tinkerpop/gremlin/process/graph/step/map/OrderTest.java
    Error:Error:line (85)java: incompatible types: java.lang.Object cannot be converted to java.lang.String

/Users/jason/IdeaProjects/tinkerpop3/tinkergraph-gremlin/src/main/java/com/tinkerpop/gremlin/tinkergraph/process/graph/step/map/TinkerGraphStep.java
    Error:Error:line (54)java: no suitable method found for collect(java.util.stream.Collector<java.lang.Object,capture#1 of ?,java.util.List<java.lang.Object>>)
    method java.util.stream.Stream.<R>collect(java.util.function.Supplier<R>,java.util.function.BiConsumer<R,? super capture#2 of ? extends com.tinkerpop.gremlin.structure.Edge>,java.util.function.BiConsumer<R,R>) is not applicable
      (cannot infer type-variable(s) R
        (actual and formal argument lists differ in length))
    method java.util.stream.Stream.<R,A>collect(java.util.stream.Collector<? super capture#2 of ? extends com.tinkerpop.gremlin.structure.Edge,A,R>) is not applicable
      (cannot infer type-variable(s) R,A,capture#3 of ?,T
        (argument mismatch; java.util.stream.Collector<capture#2 of ? extends com.tinkerpop.gremlin.structure.Edge,capture#4 of ?,java.util.List<capture#2 of ? extends com.tinkerpop.gremlin.structure.Edge>> cannot be converted to java.util.stream.Collector<? super capture#2 of ? extends com.tinkerpop.gremlin.structure.Edge,capture#4 of ?,java.util.List<capture#2 of ? extends com.tinkerpop.gremlin.structure.Edge>>))
    Error:Error:line (64)java: no suitable method found for collect(java.util.stream.Collector<java.lang.Object,capture#5 of ?,java.util.List<java.lang.Object>>)
    method java.util.stream.Stream.<R>collect(java.util.function.Supplier<R>,java.util.function.BiConsumer<R,? super capture#6 of ? extends com.tinkerpop.gremlin.structure.Vertex>,java.util.function.BiConsumer<R,R>) is not applicable
      (cannot infer type-variable(s) R
        (actual and formal argument lists differ in length))
    method java.util.stream.Stream.<R,A>collect(java.util.stream.Collector<? super capture#6 of ? extends com.tinkerpop.gremlin.structure.Vertex,A,R>) is not applicable
      (cannot infer type-variable(s) R,A,capture#7 of ?,T
        (argument mismatch; java.util.stream.Collector<capture#6 of ? extends com.tinkerpop.gremlin.structure.Vertex,capture#8 of ?,java.util.List<capture#6 of ? extends com.tinkerpop.gremlin.structure.Vertex>> cannot be converted to java.util.stream.Collector<? super capture#6 of ? extends com.tinkerpop.gremlin.structure.Vertex,capture#8 of ?,java.util.List<capture#6 of ? extends com.tinkerpop.gremlin.structure.Vertex>>))