Import and use Escodegen 0.0.18-dev.

https://code.google.com/p/esprima/issues/detail?id=401
Source rewriter demo: preserve comments.

https://code.google.com/p/esprima/issues/detail?id=402
Source rewriter demo: use Eclipse Orion as the editor.

https://code.google.com/p/esprima/issues/detail?id=402
Source rewriter demo: use a customized editor.

Also, share the custom editor setup with other demos. While at that,
group the common styles as well.

https://code.google.com/p/esprima/issues/detail?id=402
Validator demo: use Eclipse Orion as the editor.

https://code.google.com/p/esprima/issues/detail?id=403
Validator demo: display an errors with an indicator in the editor gutter.

Using Orion annotation feature, we create a warning annotation for every
syntax problem during parsing. Doing a mouse over on the annotation sign
will show the complete error description.

https://code.google.com/p/esprima/issues/detail?id=403
Merge branch 'master' into gh-pages