• Add an experimental flag to NgParser (toolFriendlyAstOrigin) which wraps de-sugared AST origins in another synthetic AST that represents the intermediate value (i.e. BananaAst or StarAst)
• Add support for parsing expressions, including de-sugaring pipes. When parsing templates, expression AST objects automatically use the Dart expression parser.

new ExpressionAst.parse('some + dart + expression')

• One exception: The | operator is not respected, as it is used for pipes in AngularDart. Instead, this operator is converted into a special PipeExpression.
• Added TemplateAstVisitor and two examples:
  • HumanizingTemplateAstVisitor
  • IdentityTemplateAstVisitor
• De-sugars the *ngFor-style micro expressions; see micro/*_test.dart.
  • Added attributes as a valid property of EmbeddedTemplateAst

• Initial commit