Ensure reek output does not include ANSI color escape codes

The metric_fu reek analyzer assumes the output is in plain text.
If ANSI color escape codes are not disabled, then the analyzer
fails to grep the correct file path and fails to open source files.
Improve testing of reek CLI options
Add line to HISTORY.md
Merge pull request #213 from phantomwhale/master

[Fix] Ensure reek output does not include ANSI color escape codes