Bump patch version
Dump patch version
Freeze contants
Show command when remote execution fail
Refactor and simplify CLI and Env:

* Do not modify Env logger from CLI;
* Add verbose attribute to Env;
* Implement Env#verbose?;
* Remove Env#log_level and Env#log_level=;
* Refactor related specs, improve some wording.
Simplify CLI
Flatten features directory tree
Remove features checking ruby evaluation
Refactor and fix features
Refactor registry feature
Improve CLI spec examples sort order
Increase default aruba timeout
Improve test suite performance with aruba wrapper:

* Implement ArubaProgramWrapper in cucumber env;
* Tag a few features to not use the wrapper as aruba doesn't support yet
  interactive testing with in process mode, and reported program name
  will not be the correct one;
* Assign required standard streams to CLI and Env classes.
Implement `test_macro' recipe keyword
Bump version to 0.2.6
Replace all raise ruby keyword with fail
Fix cucumber-sshd fast mode usage
Fix coding standards in spec
Implement `-t' CLI option switch to specify target
Bump version to 0.2.7