Version 0.7
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* Added confirmation dialogs icons
* Added comment app with support for adding and deleting comments to 
  and from documents
* Updated requirements files as per issue #9
* Show tagged item count in the tag list view
* Show tagget document link in the tags subtemplate of documents
* Made comment sorted by oldest first, made comment subtemplate
  scrollable
* Rename comments app to document_comment to avoid conflict with 
  Django's comment app
* Made document comments searchable