Extract Graph class
Merge main.js into grex.js
Expose classes in gRex.ClassTypes object
Replace for loops with _.each
Rename gremlin.params to gremlin.script
Add Gremlin.appendScript() method
Remove Gremlin._buildGremlin() method
Fix a couple variables
Add CommandBuilder class
Extract Argument class
Remove utils.js. Merge functions into Argument class.
Fix some comments
Set queryMain commands as applied functions
Replace conditional operator with if/else
Give gRex instance the responsibility to format fetched results.

- Pass gRex instance as parameter of Graph constructor.
- Give Graph instance a name property.
Give gRex instance the responsibility to send http requests
Direct use of commandBuilder for building commands

- Rename Gremlin to Pipeline class
- Instantiate CommandBuilder from Graph and Pipeline classes
Rename CommandBuilder to Gremlin. Extract Pipeline class to separate file.
Remove Gremlin instance from Graph instance
Give Gremlin class the responsibility to handle script.