Introduce concept of EditorWorkspace, top-level workspace with separate SVG element
- Add workspace initialization core test
Remove debug line
Stub asset path for local file (breaks CORS)
Fix workspace field name in SVG scrollbar
Use standard EditorWorkspace code path for instantiating function editor
Fix one more usage of scrollbar workspace reference
Expand EditorWorkspace class comment
Fix indent
Make EditorWorkspace have a Workspace (rather than be one)
Rename EditorWorkspace -> BlockSpaceEditor
Use goog.bind instead of idiom
Fix `this` scope issue
Rename workspace -> blockSpace
Fix workspace reference
Add a copy/paste test feature
Merge pull request #258 from code-dot-org/refactor_multiple_editors

[Branch only] Merge refactor multiple editors