Make non-achieved achievements more transparent, so it's clear they haven't been awarded yet.
Merge pull request #212 from jasongrout/achievement-opacity

Achievement opacity
Deleting temporary file from repository
Deleting temporary file from repository
Merge branch 'develop' of https://github.com/openwebwork/webwork2 into feature/new-ui-tools

Conflicts:
	htdocs/DATA/library-directory-tree.json
	htdocs/DATA/library-subject-tree.json