miripiruni/CSScomb-for-Sublime — pull request #5 by i-akhmadullin (2013-05-08 15:42:23+00:00)
Title: Add .no-sublime-package file to tell Package Control to extract plugin files from .sublime-package to /Packages

Apparently now fresh versions of Package Control for ST3 install plugins to `Installed Packages` as .sublime-package and way to force installation to `Packages` is to add `.no-sublime-package` file.
Ref: https://github.com/wbond/sublime_package_control/issues/349