v0.6.0: new default implementation: named stores

This release changes the default credential store implementation to use named stores all of whose credentials are in a single SharedPreference file and use the same Keystore Key for encryption. This implementation supports credential search.

The legacy store implementation is preserved under a feature flag, so existing apps can migrate their credentials to the new store implementation.

The docs have been completely revamped.

What's Changed

• Prepare release of v0.6.0 by @brotskydotcom in #18

Full Changelog: v0.5.0...v0.6.0