Create fetch_compressed_data.m

The fetch_compressed_data.m, it's a matlab script which downloads compressed data from the site at the "site_address" and uncompress them at the local folder defined by "data_dest". The supported compressed files are the following: (1)*.zip, (2)*.tar, (3)*.gz and (4) By defining the "data_suffix" any file with the specific suffix will be downloaded but also you have to define what you want to do with the specific dataset.