v0.8.5

• Add Dutch translations [Richard Venneman]
• Add Portuguese translations [Leandro Matheus]
• Improve resource model name pluralization via i18n
• Add JS API for getting/setting cookies (Trestle.cookie)
• Add toggle buttons for navigation group headers and persist state between requests
• Automatically scroll sidebar to active navigation item
• Add form error debugging (enabled by default in development mode)
• Add options[:label] option to navigation items to explicitly set label
• Allow actions column to accept an options hash
• Add show and edit button types to actions builder
• Fixed Trestle::Options hash merging in edge Rails
• Testing: test all compatible Rails versions (+ edge Rails) within Travis
• Testing: setup for feature specs