Metalinks Code

Added autodetection of language and country. Added some more test cases

Added new header file for generating metalink.py

Broke down meatlink.py into multiple files and wrote a script to remerge them. This allows for easier development and better code reuse.

Added support for resuming downloads without chunk checksums.

Forgot to changed SEGMENTED back to True, so I did that

- Code cleanup
- FTP close connection speed improvement
- Added documentation for how to use as a library
- Sort by country pref first (if set), then pref value in metalink
- reworked code to better handle URLs by creating a class

Updated test cases

Added test cases and script

- segmented download FTP size support
- support for user specified OS and language preferences
- finished FTP proxy support

# Version 3.3
# -----------
# - Bugfix for when type attr not present
# - Support for FTP segmented downloads