jQuery 改用 Google Closure Compiler
不清楚具体原因, 从 github 上的这条 commit 看到这些信息:
Switched from using YUI Compressor to Google Compiler. Minified and
Gzipped filesize reduced to 22,839 bytes from 26,169 bytes (13% decrease
in filesize). Sizzle copyright was merged into the main header (since it’s
removed automatically). Still passes all unit tests.
