[WM] update to Clojure 1.6.0
[WM] update deps to latest versions

All tests still pass.
[WM] add tests for returning maps on errors
[WM] DRY up bad-request error response structure & use it everywhere in params.clj
[WM] stop wrapping errors in a map in responses

This just sends back whatever payload was put into the response body unaltered.
[WM] fix validation error response test
Merge pull request #8 from turbovote/improve-error-responses

Improve error responses