As system, I can export Cucumber tests by specifying requirements or test plan keys in the REST API

As system, it should be possible to export Cucumber tests by specifying the key(s) of requirement(s) issue(s) or test plan(s) using the "keys" parameter.

 GET /rest/raven/1.0/export/test

Current documentation of the existing cucumber export endpoint: http://confluence.xpand-addons.com/display/XRAY/Exporting+Cucumber+Tests+-+REST