Specifically delegate calls to QueryProxy#count to the model (defined in Neo4j::ActiveNode::Labels) because Enumerable gets in the way

(cherry picked from commit 2f8e5548afe42a4b7610546aad44a50a68d5d1bd)
Merge branch 'master' into helpful_methods
fix pagination
Delegate QP#include? to the model, new include? method checks for matching ID server-side