I got this error when running PHP Code Sniffer on the theme code:
7 | ERROR | [ ] Package name "_tk" is not valid; consider "Tk" instead
"The default coding standard used by PHP_CodeSniffer is the PEAR coding standard."
Wondering if you could update your package name to follow the recommendations, also in use in phpDocumentor:
http://docs.phpdoc.org/references/phpdoc/tags/package.html