timer-ok, timer-warning time units
Add a note about time units to the README
add myself to contributors
fix spelling
Merge remote-tracking branch 'upstream/master' into measurement

Conflicts:
	README.rst
	nosetimer/plugin.py
	setup.py
	tests/test_plugin.py
Merge pull request #30 from satyrius/measurement

Time unit for `timer-ok` and `timer-warning`