v2.0.0

Note: the command line options have changed:
Be careful with existing shell scripts after updating from v1.x!

New Features:

• New scan command to list, purge, etc. remote targets.
• Add FTPS (TLS) support.
• Support Active FTP.
• Support for .netrc files.
• CLI returns defined error codes.
• Use configurable logger for output when not in CLI mode.
• Release as Wheel.

Breaking Changes:

• Write mode is now on by default.
  The -x, --execute option was removed, use --dry-run instead.
• -f, --include-files option was renamed to -m, --match.
  -o, --omit option was renamed to -x, --exclude.
• Modified format of .pyftpsync-meta.json.
• Dropped support for Python 2.6 and 3.3.

Fixes and Improvements:

• Remove lock file on Ctrl-C.
• Refactored and split into more modules.
• Improved test framework and documentation.
• Enforce PEP8, use flake8.