SecurePreferences Demo

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Uses v0.1.3 of the secure-preferences library

Not backwards compatible with 0.4.0 and older versions yet!. So if you have an existing app using this don't upgrade. I'll be looking to add migration into a later release.

- uses a new and stronger Crypto library under the hood
- includes PRNG fixes that effects JellyBean devices
- supports password based key generation so the key is not persisted
- change password supported