Update jquery.mockjax.js

update mockjax
Lib: Add jQuery 1.11.1, remove the jquery.js loader in test/
Tests: Update error-placement test for jQuery 1.11 compatibility

Closes #1158
Test: added click on radio/checkbox test
Style: Add JSCS target for Gruntfile

Closes gh-1131
All: Update copies of externals and versions of CDN references

Updates jQuery Mobile demo to use 1.4, updates Multipart demo to use
latest jQuery UI, updates requirejs demo to use latest requirejs and jQuery,
updates copy of QUnit to latest.

Closes #1164
Closes #1166
Closes #1168
Closes #1169
Closes #1170
core: Respect non-error aria-describedby and empty hidden errors