Revert "Removed pg gem and active_record dependencies"

This reverts commit 4b00bd00369dfed576f25cf004fb66c03f985e03.

Conflicts:
	Gemfile
	Gemfile.lock
Use sqlite3 locally
Added activeadmin gem and ran setup task
Added User model, converted to devise model
Added user resource for activeadmin
Adjusted the way BB starts so that it doesnt clobber the signup pages
Migration generation and update to schema.rb
Updated routes and controllers for favorites and public recipes
Generated Step model and ran migration
Generated Ingredient model and ran migration
Generated IngredientAmount model and ran migration
Added recipe_id column to Step model
Recipes now have_many Steps
A Step now has_many IngredientAmounts
Defined relationships between Ingredients and IngredientAmounts
Added name to active admin form for User model
Whoops, renamed type attr on Recipe model to category to avoid conflicts with Rails
Further defined relationships between steps and recipes
Add a super stupid to_json to index method of Recipe controller. Need to move this to a bldr template
Added active admin resources for Recipes and Inredients