E1478: Parsing of Logging Data

 - Added 'show' and 'search' methods to versions_controller.
 - Versions index now redirects to 'search'.
 - Added paginate_list method to versions_controller for paginating the
   results of a versions search.
 - Changed @version.whodunnit usages to @version.version_author for clarity
 - Gave Super-Admins, Admins, and Instructors permission to access the
   the 'version search' page, but Admins and Instructors may only search
   through their own changes.
 - Added _pagination.html.erb for use within other version views.
 - Added new search.html.erb view that contains the search form and any
   results.
 - Added a show.html.erb for viewing and deleting specific versions.
 - Added 'search' endpoint to routes.rb.

Signed-off-by: Spenser James <sjames3@ncsu.edu>