First draft of Debugger.Source specification.
Refine Debugger.Source docs.
Borrow changes from old 'origin-tracking' branch.
Document Debugger.Source.prototype.introductionKind.
Rename D.S.p.evaluationOffset to introductionScriptOffset.
Minor tweaks to Debugger.Source spec.
Minor clarifications.
Clarify that 'introductionScriptOffset' is a bytecode offset.
Define 'debuggee environment'. Don't inspect non-debuggee functions or environments.
Note incomplete iterator support.
Merge branch 'master' of github.com:jimblandy/DebuggerDocs
Note unimplemented Debugger.Source functionality.
Merge branch 'Debugger.Source'.
Formatting tweaks for Debugger.Source merge.