Add date, extract name and file type to file name of downloads

Created by: wasabideveloper

• Now: cfb360db-65e3-481d-8a09-278ecb387496_BAsk0AG.zip
• Better: 150911-HBZurich-shapefile-cfb360db-65e3-481d-8a09-278ecb387496_BAsk0AG.zip

It's not necessary to change the file name on the file system. Just change the name in the download list and the name of the download file!

Estimated duration: ~1d