Updated clarity document to reflect current direction.
First move chunk to consolidate things under ivory-operation.

The 'operation' name is pretty unpleasant, so now would be
a good time for someone to come up with something better
if possible.

This follows #175.

Ideally this would of just been ivory-tools as a first step,
but as thing turned out things were _very_ tangled up via
interdependencies on tests (which validates this consolidation
in a sense). So this change includes ivory-tools and
ivory-extract changes.
Imports.
Merge pull request #176 from ambiata/topic/un-ivory-tools

First move chunk to consolidate things under ivory-operation.
Second chunk to consolidate ivory-ingest under ivory-operation.

This follows #175 and #176.
Extra clean-up for generated thrift files.
Merge pull request #180 from ambiata/topic/un-ivory-ingest

Second chunk to consolidate ivory-ingest under ivory-operation.
Fix path to thrift file.
added a terminology page