replace quibble.browser.js with ES5 version
replace quibble.browser.js with ES5 version

- looks like this was pointed to lib originally, but got changed in 45b73bf1
- this caused modules that referenced this ES6 version of the file in src to fail unless they were transpiling quibble.browser.js

testdouble/testdouble.js,testdouble/testdouble.js,testdouble/testdouble.js