Add initial linked assets
Fix context link asset
All sass asset-path generated urls should be linked
Simple find by uri
Add processed flag to asset uri
Find required assets by uri
Raise not found exception when finding by uri
Use URIs for required and stubbed paths
Asset#uri
Use uri on input
Ensure path is UTF_8
Use uri more in directive processor
Generate uris for linked assets
Manifest compile includes all links
Merge branch 'master' into linked-assets

Conflicts:
	lib/sprockets/base.rb
Link asset to environment
Track bundle requires on included
Remove links init
Bind etag into included asset uris
Extract basic uri parser and builder