Selector: Fix sibling-of-filtered-id queries on webkit

Fixes #290
Closes #297
Release: Update version to 2.2.0-pre
Selector: Forget about elements after testing them

Fixes gh-299
Closes gh-300
Revert "Tokenization: Remove "#" exception for identifier tokens"

This reverts commit f204a6112216f31685717d9fc1bf6cabf42b2ef1.

Conflicts:
	dist/sizzle.js
	dist/sizzle.min.js
	dist/sizzle.min.map