[Caja] Fix some SES bugs. (issue1664059)

[metaweta]

Reviewers: jasvir,

Description:
Exposes more of the ___ API in preparation for working
with Domita, fixes some bugs.

Please review this at http://codereview.appspot.com/1664059/show

Affected files:
  M     src/com/google/caja/ses.js