Initializing $.store twice adds duplicate en/decoders

[gregmac]

Running the following code:

s = new $.store(); 
s.set('test', {"a":1}); 
console.log('Get 1', s.get('test')); 
s = new $.store(); 
console.log('Get 2', s.get('test')); 

results in

Get 1  Object
              a: 1
SyntaxError: Unexpected token o

This happens because .encoders and .decoders are part of the prototype, and thus globally modified every time new $.store is called.

This is an issue because I am using this in a single page application, and use it in just one model where it's needed (instead of storing a global reference and only initializing once).