Add support for remember-me with RememberMeServiceProvider
merged branch GromNaN/remember-me (PR #645)

This PR was squashed before being merged into the master branch (closes #645).

Commits
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adc172b Add support for remember-me with RememberMeServiceProvider

Discussion
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Add support for remember-me with RememberMeServiceProvider

This is a refactoring of #464.

I made a separate service provider to avoid adding more complexity to the SecurityServiceProvider.