Fix a few more issues

1) Don't use $_SERVER, use Input::instance()->server().  This fixes the problem
   that when you use a browser that doesn't pass in an Accept-Encoding, we'd
   barf on a missing array key

2) Don't bother looking up the _gz key if we don't have gzencode, because we
   probably didn't store one.

3) Only emit the gzip Content-Encoding header if we're actually sending back
   gzipped data.

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