Fix escaped identifier being treated as a keyword.

https://code.google.com/p/esprima/issues/detail?id=496
Tokens list regression check.

This is very similar to checking the syntax trees of
some popular libraries.

https://code.google.com/p/esprima/issues/detail?id=509
Add the baseline tokens for tokenizer regression check.

https://code.google.com/p/esprima/issues/detail?id=509
Tokenizer: a slash after ] is not a regular expression literal.

https://code.google.com/p/esprima/issues/detail?id=512
Update ChangeLog.

https://code.google.com/p/esprima/issues/detail?id=493