Recent changes:
- exposed --min-change value as a parameter. (was hardcoded at 200000)
- Issue #25, disable colors on non-tty
- added --no-send option. snapshots that are obsolete are now destroyed at the beginning of each dataset-transfer. this allows using --no-send as way to just thinout old snapshots. cleaned up stderr output when resuming.
- Added support for custom ssh client config