restrict uploaded file inputs to those in the form being submitted

It seems the commit https://github.com/wordnik/swagger-ui/commit/34bd474bffe1883c553990f792df63af37f18af2 caused our operations using file inputs to break. All file inputs on the page (including those for other operations) were being submitted with each request.

I restricted the domain where `OperationView.coffee` looks for file inputs. This resolved the issues we were seeing.

Note: `cake dist` caused some other out-of-sync changes to show up in the diff.