Addition of new models, controller and view for tagging project.
Merge pull request #1818 from bmuscede/tagging

Addition of new models, controller and view for tagging project.
Improvement of new tags view
Merge branch 'tagging' of git://github.com/MarkUsProject/Markus into tagging
Merge pull request #1831 from bmuscede/tagging

Improvement of new tags view
Remove the PDF to image conversion process
Remove unused  method
Remove rghost gem
Merge pull request #1835 from ChrisKdon/remove-pdf-conversion

Remove PDF Image Conversion
Added tag functionality for submission view
Merge branch 'tagging' of git://github.com/MarkUsProject/Markus into tagging
Improved CSS organization and first prototype of results view tagging
Improved Results Prototype for Tagging
migrationfiles
Merge branch 'tagging' of https://github.com/MarkUsProject/Markus into tagging
few changes to the migration files
models
initial commit; switching work machines
trying to use my _repo_files_table in repo_browser view
formatting...