Makkalot from odesk for Python position

1. Fork this repo. https://github.com/SingaporeClouds/education 
2. The current code encrypts the second column of uploaded CSV data using public key encryption before the file is saved to the blobstore. Modify the form to pass in the default public key used for encryption rather than hardcoding the public key in the python script. 
3. The current simple implementation shows a link to the last uploaded file. Modify the code to provide a list of links to download any previously uploaded files.   
4. Add a simple unittest to test your updated code. 
5. Send a Github Pull Request from your updated fork.