cleaned up indentation. created methods for repetitive tasks
created scopes for tasks. adjusted methods in task controller to use new scopes
added more scopes to task model. adjusted task controller accordingly
removed ability to change task user_id
added validation on user name. added error display to header and removed from form
add spacing where appropriate
remove double array from category selector in forms. fix validation error message in header
created categories array in task controller. updated forms accordinly