(maint) Remove dead code.

Some dead code made it through a PR.  This line is unncessary and should
be removed.
(CFACT-80) Update extensibility doc for 0.2.0.

Updating the extensibility doc for 0.2.0's support of custom facts.
Merge pull request #117 from peterhuene/docs/extensibility

(CFACT-80) Update extensibility doc for 0.2.0.