feat: new method `iterate`

BREAKING CHANGE: the method `search` has been removed and replaced with `iterate` that can potentially do the same but is based on the localForage function `iterate` and is way more optimised.

Fixes #42
feat: you can now get, set and remove multiple items at the same time

Fixes #35
feat: new method `pull`

Fixes #38
chore: bump to 1.2.0