bump slumber
Added apps reviewing page (bug 832016)
Bump app-validator (bug 841840)

* Use a warning for CSP problems on web apps
* Fix for *nix distro python builds (weird cdata support)
* Sterner CSP warnings
+ Preserve app type in the error bundle
- Remove legacy markup parser code
disable form submit buttons when form is invalid (bug 840663)
fix our linear gradients
add a script to generate app categories for Marketplace