Nutrition facts

Related Issues: #34 #52

Added karma coin dropdown button and menu to navbar
--> new pages and links to purchase, nutrition info, health benefit information

Created html (authentic-looking) nutrition facts table
--> Calculated %DV based on FDA guidelines
--> calculated denominations based on serving size

Created partial with nutrition facts, ingredients table, nutrition info

Generaly styling and re-arranging ingredients/nutrition info page

WIP: started writing up nutrition description and health benefits  (issue no. 34)