Allow ternary operators

[zangrafx]

It would be nice to change:

"no-nested-ternary": 2
"no-ternary": 2

to:

"no-nested-ternary": 2
"no-ternary": 0
"no-unneeded-ternary": 2

no-unneeded-ternary is a new feature of eslint 0.21

This would help to keep JSX simpler and would still limit bad practices. Example from react docs:

React.render(<div id={condition ? 'msg' : ''}>Hello World!</div>, mountNode);