added component ids

[mjp0]

A quick hack to make this work with multiple components using same named state variables. There's also a new variable called saveStates where you can store an array of state variable names you want to save.

...
getInitialState: function(){
   return {elems: 0, items: {}, }
},
saveStates: ['elems'],
addE: function(){
...
})

[mjp0]

https://github.com/zero-/jshistory_react_mixin/commit/3cdae581c1b78c3df0cd61b4d0bd9f08b6a5d99f I noticed that it still didn't work with multiple components and was able to store one 1 component state at the time so here's a fix that enables multiple states.