Correcting images to match text description in 01-filedir.md file

The two images **home-directories** (png, odg, svg) and **homedir** (odg, svg) had directory labels that were not consistent with the text in the file **01-filedir.md**.

Here's an example from the lesson (shell: files & directories), for **home-directories** and the mis-match between /users/larry & /users/imhotep (image shows /users/dru & /users/gorgon):

![screen shot 2014-11-18 at 4 52 53 pm](https://cloud.githubusercontent.com/assets/3809325/5110134/2f073c76-6fe4-11e4-8af1-69e13d43548d.png)

I corrected the **odg** file for both images (home-directories & homedir), and exported to **png** and **svg**, and uploaded all versions (odg, png, svg) for the pull request. **homedir.png** is a new file as this image did not have a corresponding png file like the others in this directory.

Another way I could have made the images and text match, would have been to edit the **01-filedir.md** file (correct all the instances that were mis-matched), kept the image files as is, and sent a pull request for the markdown file.