fix #104 iteritems -> six.iteritems
fix #104 iteritems -> six.iteritems

zakandrewking/cobrapy,aebrahim/cobrapy,jeicher/cobrapy,jerkos/cobrapy,jerkos/cobrapy,JuBra/cobrapy,jeicher/cobrapy,JuBra/cobrapy,zakandrewking/cobrapy,aebrahim/cobrapy