Keep folder names lowercase

[cegme]

I suggest that we should keep each of the folder/package names in lower case where it is possible. This will prevent us from running into any case management issues later. This is especially important when importing modules from python or java.

For example:
biryani/CoreNlp/ --> biryani/corenlp
biryani/Petrarch/ --> biryani/petrarch

Check out the PEP8 style guide for general guidelines.