Fix to compile with multibyte characters

If a source file contains multibyte characters (Japanese characters),
Check Syntax or Display JavaScript fails with UnicodeEncodeError on
Windows. Adding encode/decode with utf-8 works without errors.

I got the following error messages with multibyte characters source file.

```
Traceback (most recent call last):
  File ".\sublime_plugin.py", line 356, in run_
  File ".\CoffeeScript.py", line 90, in run
  File ".\CoffeeScript.py", line 32, in brew
  File ".\CoffeeScript.py", line 14, in run
  File ".\subprocess.py", line 701, in communicate
  File ".\subprocess.py", line 911, in _communicate
UnicodeEncodeError: 'ascii' codec can't encode characters in position 21-23: ordinal not in range(128)
```