v1.7.4
perf(ngAnimate): avoid repeated calls to addClass/removeClass when animation has no duration
docs(*): fix typos
chore(package): fix some warnings/errors
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
docs: fix typos throughout the codebase