Fix circular require catch
Inline cache lookups for bundled find asset
asset hash _id is unused
Push source metadata processing logic to `process`
Fix bower main with engine content type
Use custom absolute path check for performance
Avoid Pathname to expand relative base root
Merge pull request #565 from sstephenson/path-nameless

Use custom absolute path check for performance
Improve safety colon detection performance
Avoid using Pathname to detect filename's logical path
Non-recursive hexdigest compute
Concat to queue
Require normalized extension lookups
Use consistent mime type lookup api
Drop Env#attributes_for
Move content type asset attribute tests to env
Inline AssetAttributes processors
Remove pathname from asset attributes
Inline asset attributes engine extensions
Require engine extname to already be normalized