Text input does not work well when using IME

[ele828]

When updating Controlled Input Component using IME asynchronously (via proxy), the value of input will be in a mess.

There are two possible solutions:

1. Use Composition Event to handle IME input event (the drawback is that Composition Event behaves differently across different browsers)
2. Turn Controlled Input into Self-Controlled Input and combining the onFocus and onBlur event to control the props receiving process. (easier to implement)

[embbnux]

Related with #840