use Rails 4-style image-url for background image
don't rescue routing_error #88
add eager_load config option to production.rb
more fixes of asset image urls
Use the assets pipeline when referring to the sprite.png. Fixes #88
Revert "Use the assets pipeline when referring to the sprite.png. Fixes #88"

This reverts commit fc46bb559627853d83fd8639a578a321d789d5c1.
Merge pull request #89 from mfenner/rails4-fixes

Rails4 fixes
Use background property instead of background-image. Fixes #90
Merge branch 'master' into visualizations
Slightly refactor Geocode model, add specs.
Move affiliation location parser into the Geocode model
Remove ChartData
Add affiliations + location enhancement to SearchResult. Add a simple to_json method to Report model, moved from the API's ReportsController.
Enable searching purely by ids (DOIs), for on the fly metadata enhancement
Reflect the naming changes (affiliate -> affiliation) and the move of location parsing method to Geocode, in a few places