Allows a single file to run and output by default in overwrite mode. #163
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The cli instructions imply that this works, however the tool function was missing the code for it.
Also I added a final else to make sure that an error is thrown if something goes wrong and none of the other if/ifelse catch.
If you try to run just a single file on the cli:
php csscomb.php -i any_css_file.css
The cli tool reports done, however nothing happens.
Expected Behavior:
any_css_file.css is overwritten with the sorted version.