Comment nit in the underscore build. [ci skip]
Cleanup the perf and test ui files.
Add `freeGlobal.self` check to test/asset/set.js.
Cleanup lodashBizarro code to get coverage up in AMD modules.
Add `freeGlobal.self` check to support browserified code running in a web worker.

`self` is the global context name in web workers. So
`freeGlobal.self === freeGlobal` is `true` in that environment when
lodash is packaged in a library/site for use in web workers.
Add `freeGlobal.self` checks to benchmark.js and quinit-extras to support browserified code running in a web worker.