composer/installers — pull request #42 by ricardjp (2012-10-29 20:31:37+00:00)
Title: Changed locations for Drupal module and theme types

In a Drupal project the modules directory is reserved for core module files. Custom or contributed modules should be placed in their own subdirectory of the sites/all/modules directory.

The same is true for themes which should be placed in their own subdirectory of the sites/all/themes directory.

In my humble opinion the DrupalInstaller should reflect those coding guidelines.

Thx.