Add stubbed assets to dep list
Rename bundle reducer to metadata reducer
Merge pull request #656 from sstephenson/fix-stub-dep-tracking

Add stubs to dependency list
Unroll asset ivars
Merge branch 'master' into 4.x

Conflicts:
	lib/sprockets/asset.rb
	test/test_asset.rb
Test html subresources with links
Move each_file into paths concern
Move each_logical_path into legacy
Formalize load step
Cache loaded uris
Separate loader test suite
Fix digest uri cache method
Extract path digest utils
Merge branch 'master' into 4.x

Conflicts:
	lib/sprockets/asset.rb
	lib/sprockets/base.rb
	lib/sprockets/legacy.rb
	lib/sprockets/resolve.rb