Save/Load Fixes for Existing NodeJS Persistence Implementation

@eric79 , @stevencarr : Here's a pull request for the nodeJS save/load fixes.  Should have functioning saving and loading using the 'first pass' persistence style of save and load with these updates.

persistence in NodeJS server.  Updates package.json and
npm-shrinkwrap.json to include new querystring package for handling
POST param parsing.

References #2897.