Netflix / genie / 1420

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travis-ci

Globally force UTF-8 encoding of server responses

Motivation: Tomcat falls back to the default 'ISO-8859-1' charset [1] if content type is not set or ambiguous.

 - Add CharacterEncodingFilter that forces UTF-8 encoding header
 - Add new integration test for UI controller
 - Update other controller tests to check for encoding
 - Add update test to serve a non-UTF-8 file

[1] https://wiki.apache.org/tomcat/FAQ/CharacterEncoding

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