Custom permalink UI

References #3920
Remove lodash from admin client.

* Adds `bind`, `isFinite`, and `isNumber` utility functions from lodash.
* Use new util funtions instead of lodash throughout the codebase.
* Remove lodash from vendor builds.
Merge pull request #4217 from PaulAdamDavis/permalinks-ui

[WIP] Custom Permalink UI
Fix up PR #3491, remove lodash from admin

Refs #3491
Merge pull request #4329 from jaswilli/remove-lodash-requirement

Remove lodash from admin client (updates PR #3491)
Enable JSCS checking on client.

Refs #4001
- grunt-jscs@0.8.1 which provides ES6 support.