No ticket: Sync master/1.x-master README.md.
Move attr hook for value to Sizzle.

Related: https://github.com/jquery/sizzle/issues/209
Update Sizzle: fix failing tests with attributes
Update Sizzle: minor fixes
Create CDN archives in the build script.
Fix #13223. Re-allow leading space in HTML. Close gh-1264.
Only call jQuery(this) when needed. Close gh-1260.

Conflicts:
	.mailmap
	AUTHORS.txt
Use grunt option with grunt.util.spawn, close gh-1255.
(cherry picked from commit b5580a989869f0b702e60704a35e133eeee3e1fc)
Tagging the 1.10.0-beta1 release.
Updating the source version to 1.10.0-pre
Update Sizzle: empty string arguments in pseudos. Fixes #13882.