Fixes #461. Resolves via DOM a element's href.

Only acceptable if amber.js is browser-only loader.
Update not to depend on semantics of '..'.
Merge pull request #463 from herby/gh-461

Fixes #461. Resolves via DOM a element's href.
- CompiledMethod >> protocol:
- More Environment action methods
Helios:
- More commands
- source code widgets refactorings
Helios: Source code widget refactorings