Adds a DBaccess class

Adds a class to manage conections to the database
Adds a class to securize parameters received

The new class have a method to compare parameters with a regular expresion.
Modifies name to DBaccess methods.

Modifies name to DBaccess methods to homogenize language
Add the first approach to use case getRecipe

Now get a basic parameters to Recipe, these parameters are on RECIPE
table in database
Adds getRecipe to the API method.

Now getRecipe returns a JSON recipe with ingredients.
Merge branch 'backend' of https://github.com/josecriane/cookingcheats into backend
Add config.php to .gitignore
Merge branch 'master' of https://github.com/josecriane/cookingcheats
Merge branch 'master' of https://github.com/josecriane/cookingcheats
Create config.php
Change a simple config.php
Adds the new method on API, getRecipesByCategory

The new method returns a 10 recipes with selected category.
closes #12
Merge branch 'frontend'
Adds method searchRecipe to the API

Search recipes that it contains a keywords in description, name,
preparation or presentation.
closes #11
Adds a index page and style to menu