[Bugfix] update CSP addon, it works now.
Merge pull request #2136 from stefanpenner/update-csp

[Bugfix] update CSP addon, it works now.
Update broccoli related dependencies.

Does not bring any symlinking, but does improve support in preparation.
Merge pull request #2138 from rwjblue/update-deps

Update broccoli related dependencies.
Use symlinking.