[#53] Leftover "vote"
Enables Rack compression
Caches impact, adds star rating backend
Changes sort order to impact for all listings
Adds star rating to ideas
Adds button to temporarily disable card colouring
Fixes migration to keep PG happy
Merge pull request #80 from mezis/feature/rename-vote-to-endorse

Feature: Rename vote to endorse
Merge branch 'milestone/2/the-courrier' into feature/star-idea-ratings
Fixes #46.
Merge pull request #83 from mezis/feature/star-idea-ratings

Feature: Star idea ratings
AJAXifies read/unread notifications. Fixes #24.
Fixes multiple flash layout
Fixes passing flashes in headers
Cleans up controller spec
Adds and styles help text re attachements. Fixes #70.
Caches the needs avatar banner.
Swaps the checkd/unchecked icons on notifications
Merge pull request #87 from mezis/feature/attachment-help-text

Feature: Attachment help text
Merge pull request #88 from mezis/feature/ajaxify-notifications

Feature: Ajaxify notifications