v1.7.4
perf(ngAnimate): avoid repeated calls to addClass/removeClass when animation has no duration
chore(eslint): enable `quotes: ["error", "single"]`
fix(ngAnimate): don't close animations when child transitions close
fix($animate): avoid memory leak with `$animate.enabled(element, enabled)`
fix(ngAnimate): remove prepare classes with multiple structural animations
refactor(ngAnimateSwap): simplify scope creation add tests regarding creating/removing scopes