Object Versioning: renamed benchmark folder
Object Versioning: keys and enumerate traps for our proxies

keys trap triggered by: Object.keys(obj)
enumerate trap triggered by: for(var prop in obj)
Object Versioning: test cases no longer reset object tables
Object Versioning: simple Lively-specific benchmark

Lively-specific: Lively classes, subclassing, and morphic
Object Versioning: minor clean-up of ObjectVersioning.js
Object Versioning: WIP on wrapping globals that create objects
Object Versioning: further cleanup of ObjectVersioning.js