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This creates four directories beneath barback/lib/src: * asset/ contains the Asset and AssetNode classes, as well as various classes for dealing with them. * graph/ contains the classes that make up the barback asset graph, as well as utility classes that are specific to these (such as NodeStreams). * transformer/ contains Transformer and similar classes (such as TransformerGroup), as well as the classes (such as Transform) that are passed to Transformer methods. * utils/ contains utility classes that aren't barback-specific (such as CancelableFuture). R=rnystrom@google.com Review URL: https://codereview.chromium.org//261823008 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@35777 260f80e4-7a28-3924-810f-c04153c831b5