Added precursor_id to Articles-
Fixed bug, versions show threw error.
Fixed bug, not able to create new articles because of new precursor_id field.
Started writing a module for items ordered in succession.
Switched to rails 3.2.11 for security fixes.
Completed module for Active Record objects following each other in an ordered succession.
Edited update method of CategoriesController to incorporate new model methods.
Moved helper function to handle input for precursor_id to application controller.
Implemented functionality to move articles up and down.
Added time and user to article preview.
Refactored string to time function out of versions helper.