changes user grocery relation to has_one
changes GroceryListsController to reflect the has_one relationship with user
fixed the relation from grocery list to ingredients through grocery_list_ingredients
fixed the relation from grocery list to ingredients through grocery_list_ingredients
fixing a grocery_list_id error
finally fixed the grocery_list_ingredient associations
Merge branch 'master' into has_one_grocery_list
Merge pull request #55 from tararoys/has_one_grocery_list

Has one grocery list