Android theme/install-to-homescreen

- Defined android mobile chrome theme for lollipop, per
  http://updates.html5rocks.com/2014/11/Support-for-theme-color-in-Chrome-39-for-Android
- Defined manifest for install-to-homescreen, per
  https://developer.chrome.com/multidevice/android/installtohomescreen

These will both work with build M39 of chrome, available as of the lollipop
release.
Merge branch 'hotfix/android-theme-color'