Fixing indentation in unsupported plugin per linting.
per https://github.com/openannotation/annotator/pull/427#discussion_r17005769
Rolling back path change in https://github.com/opengovfoundation/annotator/commit/d4ac34139ab239d75b7b5ebbeaac3a55fcb1de7c
Revert "Replacing chai with assertive-chai."

This reverts commit 51d6b28318259a8a3778135731b3807d5c6c3061.
Merge branch 'master' into grunt-test
Redoing 51d6b28318259a8a3778135731b3807d5c6c3061 on grunt-test branch only.