check_range() again raises exception on invalid input thresholds
PerfData.get_status() returns unknown if thresholds are invalid in perfdata
change tests for changed behaviour in plugin check_range
Merge pull request #80 from pall-valmundsson/plugin-checkstatus-testfix

change tests for changed behaviour in plugin check_range
documentation updates
use TextWrapper to wrap the comments into PEP8
pylint make target for autogenerated commands
Try to make autogenerated_commands neat and linted.

Wraps method arguments and docstring.
regenerated auto commands
Merge pull request #81 from pall-valmundsson/documentation-1