major changes for the day

 - split up gremlin-node.js
 - added basic unit tests to GraphWrapper and PipelineWrapper
 - added .jshintrc configuration and fixed misc lint issues in scripts

This is still a bit WIP as far as tests go, but I wanted to go ahead and pull this sooner rather than later since it's such a change.

I think it'd be nice to move gremlin-console into the bin directory with a shebang directive for node, but I didn't do that right now as I think it may be broken still (my only changes were to satisfy the linter).