Update utils.py
Update utils.py

Some more missing pluralized items. In general, though I don't understand why an inflector is not used instead of this long list (https://pypi.python.org/pypi/Inflector)
jarekwg/pyxero,direvus/pyxero,schinckel/pyxero,wegotpop/pyxero,freakboy3742/pyxero,unomena/pyxeropos