Utils.reconsile_thresholds - new method to convert from new threshold syntax to current one
pynag.Utils - Code cleanup

PEP8 fixes
pynag.Plugins.PluginHelper - Implement timeout

Nagios developer guidelines require plugins to have a timeout
so --timeout is now built into PluginHelper.

I set a default timeout of 58 seconds, so plugins will exit with
status unknown right before nagios kills it.

Does anyone have thoughts on if a default timeout should be set or not ?