ros/catkin — pull request #240 by tkruse (2012-11-01 21:56:04+00:00)
Title: fix remove_from_env API vulnerable to subfolder arg without leading slash

last fix broke unit tests for cases where api is used with subfoldername without leading '/'

* now also manages the case where subfolder == ''
* several more unit test asserts to prevent empty subfolder breaking code
* also using os.path.sep
* also updated docstring