Copy Editing and Format Changes to 2.0

Copy edited to be more active voice and broadly readable. Formatting
changes for proper bullet points, quotation by Dr. Murray.
Merge pull request #294 from aaronesilvers/blaster

Actors, Verbs, Objects globally referenced in the spec
Merge pull request #15 from adlnet/master

Sync up!
Heather Edits 4.1.6 to 4.1.12
Merge pull request #295 from andyjohnson/master

Heather Edits 4.1.6 to 4.1.12
Global adjustments on statement vs Statement
Global adjustments on statement vs Statement