Fix private indentation
Add require
Use print in specs
Introduce separate classes for the two streams
Use one files for all the specs
Add support for regex expectations in output_to_stream matchers
Add support for composing matchers to output_to_stream matchers
Better output for regex cases
DRYing up expected logic
Add behaves like a matcher specs
Add documentation for output_for_stdout and output_to_stderr
Less code same features
Add cukes for output_to_stdout and output_to_stderr