Mention the defaults in the beginning of the README
Fix links
Debugger Cop: Added cop to check for debug calls

This addresses the first part of #534.
Merge pull request #537 from daviddavis/debugger-cop

Debugger Cop: Added cop to check for debug calls
[Fix #536] Improve description of configuration in README.md.

Move the sentence about what the configuration file is for, to the first paragraph.

Make the example .rubocop.yml file more realistic by setting parameter values that are different from the default ones.

Clarify the note about AllCops/Excludes.

Make first paragraph under "Including/Excluding files" more clear and simple.

Make "Inheritance" a subchapter, and try to use the word "inherit" rather than "include" when describing inherit_from.

Replace the word folder with directory so we use the same nomenclature throughout the README.

Make "Disabling Cops within Source Code" its own subchapter, not under "Configuration", since it has nothing to do with .rubocop.yml.