Allow not only Administrators, but Creators and Managers also, to 'use' citations.
removed (tree) maps with invalid county level interpolations
Merge pull request #29 from PecanProject/removetreemaps

removed (tree) maps with invalid county level interpolations
Modified view-related migrations so that views are dropped in the
proper order (views depending on other views are dropped first).
Modified 'group by' clauses to be compatible with PostgreSQL's stricter requirements.
Merge remote-tracking branch 'upstream/master'