Zget

- ENH: zget and put now show a short alias which can be used instead of
the filename
- ENH: added german localization
- FIX: fixed edgecase where netifaces could not find interface name

- ENH: --timeout option
- ENH: --interface option
- ENH: --address option
- ENH: --version option
- ENH: progress bar
- DOC: Documented Python interface
- DOC: CHANGELOG file

- ENH: Python interface
- ENH: Removed global variables
- ENH: Redesigned way of selecting default network interface

- FIX: Fixed handling of filenames with spaces in them in Python 3

- ENH: Allowed setting port manually
- FIX: Reading file in chunks rather than as a whole

- FIX: Fixed bug when sending file from different directory