SNClient

Changes:

 - add configuration dialog to .msi installer
 - setup windows firewall rules during installation
 - add wildcard support for includes
 - add conf.d directory support for includes
 - added check_tasksched
 - added nrpe mode to test cmd
 - fix osx installer (#27)
 - fix linux check_drivesize (#14)
 - fix missing byte in nrpe response (#21)

Changes:

- implement external scripts
- add support for client certificates
- add hashed passwords
- improve internal checks

Changes:

- implement filter and thresholds
- packaging
  - add windows service mode
- add command alias support
- add log rotation
- add optional automatic updates