fix(generator): Avoid compile-time filter map querying when generating static parser.

This fixes https://github.com/angular/angular.dart/issues/432.

Also consistenly load libraries through the package root to avoid getting in
trouble if the same library is loaded through different URIs.
fix(expression_extractor): implemented support for wildcard attr selector

Fixes #447
fix(parser): Workaround dart2js bugs in latest version of Dart SDK 1.2.