[MDCActivityIndicator] Add API documentation links to README.md (#950)
[MDCActivityIndicator] Add API documentation links to README.md (#950)

* [MDCInkView] cancelAllAnimationsAnimated should support disabling animation

* [MDCProgressView] Allow completion block to be modified if setHidden:animated:completion is called sequentially

* Call completion block immediately rather than storing as a property.

* Add nil check for completion block

* [Shrine] Update to Swift 3

* [AppBar] Add Objective C AppBar storyboard example

* Add right button bar item to AppBar swift demo

* Add plus shape icon to FAB

* Move plus symbol to example code

* Add plus icon asset, move to supplemental

* Remove unused methods

* Undo change to print.

* Move plus CAShapeLayer code into its own method

* Remove plus path method

* Use supplemental method to get plus symbol CAShapeLayer

* Update md shadow elevation description.

* Add API documentation links for activity indicator

material-components/material-components-ios,chriscox/material-components-ios,randallli/material-components-ios,brianjmoore/material-components-ios,sigito/material-components-ios,Eccelor/material-components-ios,samnm/material-components-ios,samnm/material-components-ios,brianjmoore/material-components-ios,samnm/material-components-ios,randallli/material-components-ios,willlarche/material-components-ios,willlarche/material-components-ios,material-components/material-components-ios,Eccelor/material-components-ios,samnm/material-components-ios,material-components/material-components-ios,Eccelor/material-components-ios,randallli/material-components-ios,willlarche/material-components-ios,material-components/material-components-ios,Eccelor/material-components-ios,chriscox/material-components-ios,chriscox/material-components-ios,chriscox/material-components-ios,chriscox/material-components-ios,willlarche/material-components-ios,brianjmoore/material-components-ios,willlarche/material-components-ios,randallli/material-components-ios,sigito/material-components-ios,randallli/material-components-ios,Eccelor/material-components-ios,randallli/material-components-ios,sigito/material-components-ios,brianjmoore/material-components-ios,material-components/material-components-ios,sigito/material-components-ios,brianjmoore/material-components-ios,samnm/material-components-ios,sigito/material-components-ios