Fix Bug 976071 - Tags shouldn't be case sensitive

Added Tags Test Cases for case insensitive tests
fix bug 976071 - test list_documents view by tags is case-insensitive
Merge pull request #2712 from groovecoder/list-docs-tags-case-976071

Fix Bug 976071 - Tags shouldn't be case sensitive
Fix bug 1057286: Split file attachments from wiki into a separate application.