Documentation/BDD-Cucumber and Data Driven

[JakubStyszynski]

BDD-Cucumber:

• reorganized section to be more clear
• some information was duplicated, it is changed to get everything in one place
• more description and examples for feature files, step definitions, test runner, organizing tests
• shortened subsection How to run Cucumber tests in Mr.Checker

Data Driven: -added ToC

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}