Mods to visualize graph traversals in gephi by coloring memory stored nodes
Removed unwanted debug println
Added documentation for Gephi plugin
@pietermartin --- I added IdentityStep skipping and IntervalStep adding to Neo4jGraphStepStrategy. Is there a reason you didn't have these two elses{} ? ... Ref #18
Add Neo4jStepLoader to add groovy sugar to Neo4jTraversal.

Write docs for cypher changes.
Merge remote-tracking branch 'origin/master'
using clock() for testing TinkerGraph index runtimes for the documentation.
minor tweaks to @spmallette Cypher documentation.
added gremlin-loves-cypher logo for Cypher docs.
minor tweak to image.
fixed docs for @joshsh.
minor memory optimzation and typesafety for Neo4jCypherIterator.
fixed up Neo4jTraversal.
lots of tweaks organizing Neo4j code. Also, we use traversal.memory.set(Graph.Key.hide(g)) so much that I added default methods: Memory.getGraph(), setGraph(), removeGraph(). Makes things MUCH LESS error prone.
Extract property exception consistency tests to PropertyTests.
Move vertex/edge consistency tests.
Migrate exception consistency checks to their individual classes.
Migrate transaction tests to TransactionTest class.
Remove blueprints comment.
Make naming consistent around exception consistency.