Merge branch 'release/0.1.3' into develop
Added debug.log to log echos inside tests.

- Uses verbosefile, so will also show messages that other plugins will report.
- An alternative was :redir to trap all echos, but that may interfere with plugins
  that need to capture ex command output. Since :redir can't be nested, we could
  potentially alter plugin functionality. Avoid.
- Another alternative was to introduce a logger object with .info, .fail etc.
  This would need modification to the dsl, and custom code to handle variadic args
  that echo already handles quite well.
- verbosefile is our best bet for now.
Added tag option to executable.
Added tagging support.

- Use tags add the --tag <tagname> option to the command line
- And in the spec file's test method add _tagname suffix to the test method
Added tagging support and :vim_version only in CI
Merge branch 'feature/add-tag-support' into develop
Bumped version to 0.1.4
Merge branch 'release/0.1.4'
Merge branch 'release/0.1.4' into develop
Bumped version to 0.1.5
Merge branch 'release/0.1.5'
Merge branch 'release/0.1.5' into develop
Bumped version to 0.1.6
Merge branch 'release/0.1.6'