Add idb-connector to Dependencies in Package.json

[Musse]

Package.json Should list idb-connector as a dependancy because it is required on line 50 of istroedp.js.

  db = require('idb-connector');

That way if someone npm installs itoolkit without already having idb-connector it will work.

[Aaron Bartell]

I think the reason we originally didn't put it as a dependency is because the iToolkit can be used in an HTTP scenario where idb-connector isn't required. With that said, it is much more often the case that the iToolkit is used in scenarios where idb-connector is required so I am in favor of this change.

[mengxumx]

@ThePrez what's your opinion?