Update requirejs to compatible version, remove r.js
Fixes #14450. Remove CommonJS+AMD syntax.
Remove comment
Unify build script capabilities between branches. Specifically, added a special comment pragma for removing certain lines.
Fix #14432: Always return string from .css("z-index"). Close gh-1395.
No ticket: Small curCSS size optimizations
No ticket: Test cleanup
Preparations for npm/bower publishing
Fix #14394: Changing style !important in webkit. Close gh-1385.
No ticket: Clean up uglifyjs compress options. Close gh-1382.
(cherry picked from commit e15627022f0c5e13a972baffb41f6f52ca4d3ec3)