Add animation samples (#118)
* initialize animations sample project
* add two demos, set up routing
* clean up expand_card demo
* update README
* clean up expand_card demo
* dartfmt
* update comment
* address code review comments
* swap AnimatedContainer and AnimatedCrossFade
* use AnimatedSwitcher instead of AnimatedCrossFade
* Revert "use AnimatedSwitcher instead of AnimatedCrossFade"
This reverts commit e112e02549.
* rename expanded -> selected
* use Dart 2.4.0 constraint
* update README
* address code review comments
update images
add curves to expand_card
update pubspec.lock
* add @override annotation
* add animations project to travis script
* add empty test for travis
* add copyright notice to animations/ project
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John Ryan