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Improve documentation for _sortEntityCollectionByImage in activity.js
Merge pull request #2603 from bp323/issue-2601

Improve documentation for _sortEntityCollectionByImage in activity.js
Added all dependencies for the documentviewer in the lib.
Merge pull request #2605 from simong/fullblowndocviewer

Added all dependencies for the documentviewer in the lib.
Merge branch 'Hilary' into deleteComment