upgrade grunt-react to 0.10.0
fix react 0.12.0 require non-DOM component namebe Capitalized
rename props.key & props.ref to .key & .ref
remove classSet and cloneWithProps utils, get them from react/addons
change NavItem key to navKey since key is no longer accessible from
inside the component
replace key with navKey
all tests green
replace React.PropTypes.renderable with React.PropTypes.node
bump to 0.12.1, update react version to 0.12.0