Progress bar doesn't work with codecs.open when using encoding

[mina-asham]

Progress bar crashes while trying to get a length hint of a file that is opened using codecs.open function.
Python version: 2.7.11 (64bit) on Windows
Output:

raceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Program Files\Python27\lib\site-packages\click\termui.py", line 306, in progressbar
    width=width, color=color)
  File "C:\Program Files\Python27\lib\site-packages\click\_termui_impl.py", line 73, in __init__
    length = _length_hint(iterable)
  File "C:\Program Files\Python27\lib\site-packages\click\_termui_impl.py", line 33, in _length_hint
    return len(obj)
  File "C:\Program Files\Python27\lib\codecs.py", line 728, in __getattr__
    return getattr(self.stream, name)
AttributeError: 'file' object has no attribute '__len__'

To reproduce:

import codecs
from click import progressbar

file_path = 'my_file.txt'

with progressbar(codecs.open(file_path, encoding='utf-8')) as progress:
    pass

The same code works as expected when not using encoding parameter, mainly because codecs.open return the basic open() method result if no encoding is specified.

The _length_hint function catches the TypeError exception but this one produces an AttributeError exception, should be modified to include the AttributeError type as well.

[untitaker]

Fixed with #637