Change the changelog header style
Revert "Fix #13983. Switch to //# for sourcemaps."

Per the discussion here:
https://code.google.com/p/chromium/issues/detail?id=256636

Thanks to the Chrome team for the quick response!

This reverts commit d53ddc90c1f119fb9148a553443ef3fbc3f3cc99.
Tagging the 2.0.3 release.
Updating the source version to 2.0.4-pre✓™
Update Sizzle to version 1.10.3-pre
Support CommonJS environments by accentuating the need for a window with a document. Fixes #13768.