Add second data source

• add a scraper accessing the IEX API
• add an abstract base class for all scraper to ensure the interface
• add a scraper that accesses all other scrapers using different approaches
• add test coverage detection
• update example scripts (full example now writes to a file)

Return data refactoring

Changes:

• replace the returned dictionaries with purpose built objects
• update documentation
• add automated testing
• add currency converter tests
• update and improve example scripts
• restructure project (folder structure)

User setuptools

• use setuptools own functions to get pip distribution working

pip distribution fix

HOTFIX: pip distribution did not work because of missing packages

Documentation Creation

Add the following to this project:

• add a proper README to the project
• add a documentation to the project
  • document project setup
  • provide a quickstart guide
  • show the interface in detail
• add tests to ensure the project survives through refactorings