Feature: Initial Codeclimate configuration files

[vovimayhem]

What does this PR do?

Adds example .codeclimate.yml configuration files, including a prepare stage which fetches the plugin/engine rule configuration used for all projects on Icalia Labs for the following kinds of projects:

• A typical Rails project, including configuration for Rubocop and Reek, SCSS, CSS, Javascript, Coffeescript, etc.

• A typical Python project, including configuration for PEP8, Sonar Python, SCSS, CSS, Javascript, Coffeescript, etc.

• A typical javascript/node project, including configuration for ESLint, SCSS, CSS, etc.

[vovimayhem]

@kurenn I'm gonna go forward with this, so it's available at the master branch. We'll discuss later the rules & etc.