Add composition event for Input component

[WarnerHooh]

This to fix the unexpected value got when Input change event callback with non-Latin language enter.

[coveralls]

Coverage remained the same at 100.0% when pulling 5c24dbd on WarnerHooh:input-composition-event into 5eae362 on react-component:master.

[yesmeck]

Sorry, this is a breaking change, if you want handle composition event, you can use getInputElement to provide a custom input.