Get rid of Cache::new(). Either replace with default, or don't replace it at all.

[hgzimmerman]

Currently, Cache::new() makes some opinionated choices for the user, which should be covered by a Default impl instead.

By default:

• The size should be unbounded.
• No Min size
• No Max size
• Default priority function
• Accesses per refresh should not be provided (never refresh).

Possibly a warning should be logged indicating that users of the method should use the builder instead.

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Alternatively:

Don't replace it at all. Force users to use the builder, which would have the same outcome as the Default impl anyways.

[hgzimmerman]

Has been deprecated. Will remove for 1.0.0 release.

[hgzimmerman]

Being removed for 1.0.0-beta release.