Fix #13983. Switch to //# for sourcemaps.

Normally we'd avoid doing this on a patch release, but Chrome Canary is
spewing deprecation warnings already and that's generating bug tickets.
(cherry picked from commit d53ddc90c1f119fb9148a553443ef3fbc3f3cc99)
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.
(cherry picked from commit 6e630fbbb19306e1914712502a2b22872e94ddad)
Change the changelog header style
(cherry picked from commit a44202dc604d14688756ae0cccde0fec53e53dbf)
Update Sizzle to version 1.10.2
Tagging the 1.10.2 release.
Updating the source version to 1.10.3-pre