Add sub-sections to the compaction section to describe the effect of different term definitions on compaction. This includes describing @type: @none.

For w3c/json-ld-api#33.

Author: gkellogg

Gemfile.lock

@@ -1,6 +1,6 @@
 GIT
   remote: git://github.com/ruby-rdf/json-ld.git
-  revision: 6bb0c2d269e8cf80152d519ee5fd16696812b1f2
+  revision: 147930bfd2bceeef4d6f79f203cddc4134e3b65d
   branch: develop
   specs:
     json-ld (3.0.2)