notes on discrete resources and materials and tracking
rough draft paragraphs on interchangability
moved last sentence back to second p
initial sentence regarding hierarchy
rough draft of RIF section
added cluster section
Merge pull request #35 from gidden/htc

Htc
Merge pull request #34 from gidden/hierarchy

Hierarchy
Merge pull request #30 from rwcarlsen/res

notes on discrete resource/material and tracking
added interchangeability section