0.0.8 - last few changes before full release

[changed] moved instance.storage.persist() to instance.persist() to make it easier to access
[changed] changed the config name from { Storage: {} } to lowercase { storage: {} }
[added] Support for setting a custom prefix key for the storage new SimpleStorage({}, { storage: { prefix: 'customPrefix' } })
[changed] updated/changes a few typings

This library is most likely ready for the full release pretty soon