feature: `--convert` option first pass
Fix: rework `exec` arguments, fix jsHint complaint
Check for `sass-convert` binary prior to run the convert task
JShint bro
Fix: Hugo review items
Rename `--convert` option into `--sass-convert`
Improve `convert` task logged messages.
docs: added `--sass-convert` option to Readme.
Split convert API + minor refactor
test: add unit tests for `sass-convert` task
- disabled for now
Refactor + add version check on `sass-convert` option
Update changelog
test: update and enable `sass-convert` option tests
Update changelog + minor comment fix
Manual merge of #205