v0.5.0

• Upgraded to depend on React ^0.14.0.
• Refactored the component by removing its internal state and making it more functional. Instead of managing its own state, it only renders value prop. Any changes received by the component will be passed to its delegate through onChange callback, in which a state update can occur.
• Removed values and defaultValues props. value and defaultValue can now accept a number or an object of numbers.