angular/angular.js

…mmits

Instead of using fix() or chore() when labelling a commit which improves
speed or performance use perf(). Perf commits will be listed in the
CHANGELOG under "Performance Improvements".

For example:
perf($animate): cache all getComputedStyle operations to reduce additional reflows

… messages from 70 to 100

Revert 581ec6b since it was not valid.

Closes #3952

If you `cd` into the repo, `validate-commit-msg.js` will be in the root
of it.