Merge pull request #25 from sesuncedu/master

add version IRI
Split modules directory into content & mapping

Created directories for content modules and mapping modules, seeded each
with short text file describing what goes in. Should not cause problems
as there aren't yet any ontologies in the modules directory.
fix stray entity IRI
Merge pull request #26 from sesuncedu/spindle_bottom

fix stray entity IRI
Added working file for annotations to fix issue #22

I will be working directly in this file to add clarifying annotations to
the vocref-top concepts. This should enable these annotations to be
available in quick iterations without interfering with more substantial
work on -top for now. Since they are just annotations it will be
relatively straightforward to refactor/merge when ready.
Merge branch 'master' of https://github.com/ajvizedom/vocref
fix more IRI issues