v0.5.0

• [BC break] Changed the .eslint.yml to .eslintrc.js to satisfy the ESLint CS.
• [BC break] Renamed scss-lint.yml according Scss-lint standards.
• Added support for spec files in the PHP-CS-Fixer.
• [BC break] Now, PHP-CS-Fixer can execute in standalone way.
• [BC break] Updated PHP minimum stability to v7.1.
• [BC break] Moved all the project to the according folder structure.
• Upgraded the PHPCsFixer to v2.