Various Rails model caching optimizations to reduce database load and increase performance
Override ScriptLevel.script, ScriptLevel.stage, and Stage.script to always return the deep-cached model object
Add Script.cached, Stage.cached to replace shallow model object with the deep-cached equivalent
typo
re-disable concept progress and trophies
whitespace changes
Merge pull request #808 from code-dot-org/rails_cache_model

Rails model caching