Added base urls which are endpoints for each environment (production or sandbox). The api key dictates the environment.
Merge remote-tracking branch 'origin/master'

Conflicts:
	build/embedded-dot-syntax.js
	build/embedded-dot-syntax.min.js
	build/embedded-str-syntax.js
	build/embedded-str-syntax.min.js
	build/widgets.js
	build/widgets.min.js
	package.json
	src/widgets/api/authorize.js
	src/widgets/api/collaborate.js
	src/widgets/api/list.js
	src/widgets/api/playback.js
	src/widgets/api/record.js
	src/widgets/api/upload.js
re-built with package.json config url reverted