Create 'General Conventions' section.
Add page-delimiter settings in wikimedia files.
Document browser tab actor interactions.
Incorporate Panos's comments.
Update protocol to describe loading sources
respond to Jim's feedback
respond to Jim's feedback again
Merge pull request #6 from fitzgen/master

Update protocol to describe loading sources
Document Debugger.Object.prototype.unsafeDereference.
Clarify actors' different communication patterns.