Allow use of `el` in RegionManager.addRegion definition.

Throw error if impropper configuration passed to RegionManager.addRegion.
Merge pull request #1774 from jaridmargolin/master

Allow use of `el` in RegionManager.addRegion definition.
s/appliction/application/
Merge pull request #1776 from moimikey/mh/jsdoc-application-hotfix

typo in application.jsdoc