continue work on advshell (Python 2)

[jgonggrijp]

@zed0 made a start with advshell.py, a textadventure game that lets you explore your file system as if the directories are rooms. He informed me that he might want to work on it again in the future, but anyone is welcome to work on it in the meanwhile.

In order to get your own local branch for working on this, I suggest that you run the following commands (of course you don't need to add zed0 again if you already had him):

git remote add -f zed0 git://github.com/zed0/the-red-spider-project.git
git checkout 11308223d250cba
git checkout -b advshell
git pull upstream master

After this you can just follow the regular workflow as described on the wiki.

Note: for historical reasons you could also obtain advshell.py from zed0/master or from zed0/advbrowser, but it's better to not do that because both of those branches incorporate changes unrelated to your topic. See also issue #36.