Squashed 'angular-playground/' content from commit d3432a0

git-subtree-dir: angular-playground
git-subtree-split: d3432a0248dcc627913a9b95bc3a9bdb96ee786c
Merge commit 'c4e5fa48c281940e8327bc2bb14baf2300e5ba1e' as 'angular-playground'