Google Cast: Add cast button

Added cast button on MovieDetailFragment, PlayerActivity.

Signed-off-by: Taeho Kim <jyte82@gmail.com>
Google Cast: Connect to cast device when selected

Signed-off-by: Taeho Kim <jyte82@gmail.com>
Merge commit 'e5f9523b83f5c3d313374eb8635eed7d8a3245c4'

Conflicts:
	mobile/build.gradle
	mobile/mobile.iml
	mobile/src/main/AndroidManifest.xml
	mobile/src/main/java/com/gdgkoreaandroid/multiscreencodelab/MovieDetailFragment.java
	mobile/src/main/res/values/strings.xml
	wear/wear.iml