Removed uncaught exception handler.

It was causing a weird error:

http.js:704
    throw new Error('Can\'t set headers after they are sent.');
          ^
Error: Can't set headers after they are sent.
  at ServerResponse.OutgoingMessage.setHeader (http.js:704:11)
  at ServerResponse.format (./restify/lib/response.js:84:22)
  at ServerResponse.send (./restify/lib/response.js:197:32)
  at next (./restify/lib/server.js:663:37)
  at ./restify/node_modules/once/once.js:17:15
  at serveFileFromStats (./restify/lib/plugins/static.js:35:25)
  at ./restify/lib/plugins/static.js:76:41
  at Object.oncomplete (fs.js:107:15)
Update swagger ui.
Added configurable `base` parameter to `Service#listen`.

This configures swagger's `basePath` property.