Add link to the post about HSTS from IEInternals
Add ex. on allowing cross-origin resource timing

Provide example on how to set the `Timing-Allow-Origin` header
in order to allow cross-origin access to the timing information
for different resources.

Ref: http://www.w3.org/TR/resource-timing/
Update `CHANGELOG.md`
Improve inline comments about `AddEncoding`

Explain better what the `AddEncoding` directive does as it seems that
people are confused by its usage (see: https://github.com/h5bp/server-configs-apache/issues/16#issuecomment-52095603).

Ref: http://httpd.apache.org/docs/current/mod/mod_mime.html#addencoding
Improve configs for `.rdf` files

* Make Apache serve `.rdf` files with the charset parameter set to
  `UTF-8`.

* Add configs for the cases¹ when the media type for `.rdf` files
  is set to `application/rdf+xml`, namely, ensure that Apache serves
  files marked with that media type compressed and with far future
  expires headers.

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¹ https://github.com/h5bp/server-configs-apache/commit/db6932740a90a36cbbf8b38627fc034d595471c0
Update `CHANGELOG.md`
v2.8.0
Merge pull request #2 from h5bp/master

Update from original