SNClient

Changes:

 - add support for perf-config option
 - add support for case insensitive regular expression matches
 - add support for case insensitive string matches
 - add support for builtin check_nsc_web
 - improve documentation
 - check_disk: ignore drives which have problems but are not required

Changes:

 - relative include paths are now considered to be in the parent ini-file
 - wmi: improve error handling

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)