Jasmine 1.x exposed Suite objects to user code as the `this` in describe
functions. That should have been removed in 2.0 but it was missed. It
will be removed in 4.0. This change adds a deprecation warning if anything
on a describe's `this` is accessed.
The deprecation warning relies on Proxy, and won't work in environments
that don't have it. Among Jasmine's supported environments, that's Safari 9,
Safari 8, and all versions of IE. In those browsers, a describe's `this`
will still be a Suite for now, but there will be no deprecation warnings.
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