Better implementation of autoIncrement

Before this patch id === null was required for autoIncrement ids.
This patch also accepts id === undefined
Merge pull request #40 from amiuhle/backbone-1.0

Upgraded to backbone.js 1.0.0
Merge pull request #41 from manuels/patch-2

Better implementation of autoIncrement
Clear stack of ExecutionQueue to prevent memory leakage
Merge pull request #44 from dongseok0/master

Clear stack of ExecutionQueue to prevent memory leakage
Allow overriding `storeName` in `options`
Merge pull request #45 from amiuhle/patch-1

Allow overriding storeName in options