[database] Database schema cretion

* Update Gems of the project
* Include Fabrication Gem instead Factory Girl
* Models, Factories and FakeTests for: Category, Ingredient, Language, Picture,
Recipe, User and RecipeIngredient
* Remove FactoryGirl from Generators and rails_helper
* Generate User with Devise generator
Merge pull request #5 from pragmaticivan/database

[database] Database schema cretion