Update debug format to JSON and add hooks for Closure Inspector.

[ihab...@gmail.com]

Reviewers: metaweta,

Description:
- Update debug data in the module format to be correct JSON.

- Add hooks in cajita.js to support debugging using the Closure
Inspector, which is soon to release support for Caja. Please see:

http://code.google.com/closure/compiler/docs/inspector.html

Please review this at http://codereview.appspot.com/152129

Affected files:
M src/com/google/caja/cajita.js
M src/com/google/caja/render/SourceSpansRenderer.java
M tests/com/google/caja/parser/quasiliteral/testModule.out.js
M tests/com/google/caja/render/ssp-golden.txt