Rename selectionFactory vars to varStack
VarStackTest
Introduce IterationRoot to keep the common iteration context.
Comment
IterationQuery -> GremlinPipesQuery
Fold
Rename factory vars to varStack
TODO comment
GremlinQuerier
GremlinQuerier - add support for initial vertices.
Comment
getInitialVertices()
Add setSelectionManager() to IterationRoot.
Link to Gremlin Groovy docs.
Link to Gremlin Groovy docs.Rename factory vars to varStack (tests)
Attempt on     WINDUP-93 ForEach, shorter alternative to Iteration
Remove unnecessary method.
Prepare VarStack for     WINDUP-97 Split VarStack to VarStack and CurrentItems
Remove duplicate file
Microoptimize