Upgrade downsize to 0.0.4

refs #1095
- added new unicode test to excerpt helper
Fix error when uploading logo/cover image

closes #1616
- removed pars from model
- changed checkbox handling
Merge pull request #1608 from halfdan/1095-unicode-words

Upgrade downsize to 0.0.4
Merge pull request #1629 from sebgie/issue#1616

Fix error when uploading logo/cover image
Update dependencies.

- Important update for express (contains __proto__ fix in qs)
- Update all other dependencies to latest
Merge pull request #1622 from halfdan/update-deps
Serving static assets via asset-rack

closes #1405
- adds asset-rack to package for serving assets
- moves all assets previously served via express.static into an asset rack
- handles url generation for statically served assets
- updates the asset-helper for hbs-templates to get the right url