Mon-Ouie/coolline — pull request #18 by berlysia (2014-08-31 00:31:51+00:00)
Title: Improvement handling of multibyte characters

When we type multibyte chalacters, as follows:

```
$ ruby repl.rb
>> "abcdef"
=> "abcdef"
>> "あ >> "あい >> "あいう >> "あいうえ >> "あいうえお >> "あいうえお"
=> "あいうえお"
>>
```
![screen shot 2014-08-31 at 9 30 43 am](https://cloud.githubusercontent.com/assets/950573/4100619/11962b52-30a6-11e4-8bab-9049561aec3e.png)

This PR makes like this:

```
$ ruby repl.rb
>> "abcdef"
=> "abcdef"
>> "あいうえお"
=> "あいうえお"
>>
```