indexed-db adapter now passing all tests. details below:
indexed-db adapter now passing all tests. details below:

* added lots of chaining bits
* added lots of callback magic
* added batch()
* add support for store.get(Array) signature

ref #13

jensarps/lawnchair,D1plo1d/lawnchair,brianleroux/lawnchair,brianleroux/lawnchair