Setting Object properties in js from cc

Each method creates a new Object then iterates over and sets the
properties on that Object.

setInCCSlow - Creates a new String for each key every time
setInCCSym - Uses pre-defined Persistent Strings for keys
setInJS - The Object and values are passed to a js Function where the
          Object properties are set
SetInJSObj - js creates the object and sets its properties

The mean speeds on my box:

setInCCSlow - 1615ns
setInCCSym  - 830ns
setInJS     - 405ns
setInJsObj  - 112ns

So by creating the object and setting the properties in js the operation
can be performed up to 13.5x's faster.