test(angular): fix exported symbols

Closes #965
Work in progress- relative URIs

Making template and CSS URIs relative to the library in which the type which is annotated resides.

Also making all URIs within the template and CSS files be relative to those files.
Code cleanup based on feedback:

- Changed AbsoluteUris to be top-level methods rather than all statics.
- Clarified unittest for Image by setting attributes rather than src directly.
- Changed multi-line comments format from /// to /** syntax
Additional cleanup items

 - package-relative URIs are now 'packages/' rather than '/packages/'.
 - Support for mirrorless mode with a transformer. This transformer generates
   one large table for type->URI lookups.
 - Integrated with tip-of-tree Angular

This generates a global table of type to URI lookups
Rebase on master: NgComponent -> Component
Eliminate AnnotationUriResolver resolution failure
Handle component-relative templateUrl in expression codegen.
Use path.url.isAbsolute
Add test case for cross-package templateUrls
Use AnnotationUriResolver instead of a manual Uri.resolve
chore(tests): Remove 'new Symbol' call to reduce dart2js memory usage
docs(VmTurnZone): Fix some messed up markdown.

Closes #968
feat(compiler): bind- syntax

Adds support for bind- syntax which allows directive users to
give an expression for any mapping.

For #650
Closes #957
hack(travis): Increase dart2js' heap size
chore(tests): Remove a ddescribe
feat(LRUCache): Support zero-length caches
perf(compiler): 31%. Cache CSS in Style elements.

In a benchmark, I saw a 31% speedup while creating components which include
unminified Bootstrap (125K) as a cssUrl.
fix(travis): Curl should follow redirects when fetching scripts
test: Add more tests related to types exposed from a component.

Closes #885

Closes #958
feat(debug): Make ngProbe accept a CSS selector

Closes #970