Spiking the new EmbeddedSection grammar
Step can hold named collections in prep for compound grammars
Big refactoring of StepHolder so that it doesn't need the FixtureLibrary
EmbeddedSection grammar object can read and build Step's
Can read EmbeddedSection's in the specification reading
Can edit embedded sections in the editor now
Wrapping up EmbeddedSection

Closes GH-15
Closes GH-44