samvera / questioning_authority / 753

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Pull #172

travis-ci

add support for CORS headers

* Added CORS support as a configurable option that can be enable or disabled.  It is disabled by default to maintain backward compatibility.
* When CORS is enabled...
  * Adds CORS response 'Access-Control-Allow-Origin' for all GET requests
  * Handles OPTIONS method requests for supported routes and responds with supported methods and allow origin header
* When CORS is disabled...
  * The 'Access-Control-Allow-Origin' header is not added to GET requests
  * If OPTIONS method is requested, a 501 (not supported) response is returned

REF: https://fetch.spec.whatwg.org/#http-cors-protocol

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