Note that it supports Python 3

I started writing io_bit.py and io_midi.py in Python 2, so I took care of them for 3.

Related) http://d.hatena.ne.jp/yoya/20141106/io_midi

--Specify "b" to open the file as binary. (It works even if it is not 2)

X data = open(file).read()
O data = open(file,"rb").read()

――By the way, this is the error that appears in 3.

  File "/usr/local/Cellar/python3/3.4.2_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/codecs.py", line 313, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe0 in position 13: invalid continuation byte

--Since the cut out data is also binary (byte string), add b like data == b "~" in the comparison check.

X   chunk == "MThd"
O   chunk == b"MThd"

--has_key cannot be used, so use in.

X a.has_key("x")
O "x" in a

--Rewrite cutting out 1 byte from a byte string to specify a range.

 X bytes [i] # ← In this case, the behavior is different between 2 and 3.
O bytes[i:i+1]

$ python2 -c 'print(b"AB"[1])'
B
$ python3 -c 'print(b"AB"[1])'
66
$ python3 -c 'print(b"AB"[1:2])'
b'B'

--Fixed hard tab to soft tab. (2 works on hard tabs)

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