Refactored AbstractCodeGenerator >> pseudoVariables
Helios: Handle package addition
Fixed HLRenameClassCommand class >> key
Adds Environment >> classes
Adds Environment >> allSelectors
Fixes issue #460
Helios:
- New HLModel common superclass of Helios models
- Beginning of a references browser
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
fileOut FileServer.st

This moves around some of the methods.
Add --fallback-page switch for issue #417

Run like this:
./bin/server --fallback-page index.html
All 404 pages will be 200 using index.html instead.
Recompile server
Merge pull request #447 from jeromebaum/issue-417

Add --fallback-page switch (fixes #417)