New module: Utils.state

Its purpose is to be the one-and-for-all representation of nagios states.

This should eventually obsolete the constants and dictionaries in pynag.Plugins
Utils.states - Improve docstrings
Merge branch 'master' into add-module-states

Conflicts:
	pynag/Plugins/new_threshold_syntax.py
Fix missing import of states
Merge pull request #198 from pynag/add-module-states

Add module states
Merge branch 'master' into fix-broken-doctests-merge

Conflicts:
	pynag/Plugins/__init__.py