Batch normalization

[bato3]

Big optimization, includes:

• Endpoint renaming - because the entire URL obscures the view and the actual URL is in a different part of the schema (remove {{base_path}}/api/index.php/v1/ from item.name)
  
• Rename variable {{base_path}} to {{base_url}}, because I need this name for next variable :)
• Set api/index.php/v1 as variable - because in NGINX it's easier to run SEF than classic links. (I can use only api/v1/, default don't work)
• Set api key as variable {{auth_apikey}} - that's a recommendation from Postman
• Discover variables in URL-s e.g. {{article_id}}
• Normalize URLs to: {{base_path}}/{{base_url}}/important-part-of-the-url, and all variables are double moustached
• Normalize JSON body, because all fields should be double-quoted, (discussion in escape single qote in "Here's an article" #18)
• Fix descriptions, because body was reformatted and alexandreelise don't allow remove it (Purposefulness of the description field.  #20)

[alexandreelise]

Hi @bato3 Your pull request has been merge in a new branch dedicated to your improvements. If you would will to enhance more please pull request against that branch rather than master. Thanks for your contribution. Have a great day.