Windows encoding of __init__.py breaks setup with certain locales

The ```setup.py``` script parses the version number from the ```adal/__init__.py```. This can fail with certain locales on Linux when Python3 is being used:



```bash

glaubitz@suse-laptop:~/upstream/azure-activedirectory-library-for-python> LANG=C python3 setup.py build

Traceback (most recent call last):

  File "setup.py", line 35, in <module>

    open('adal/__init__.py').read()).group(1)

  File "/usr/lib64/python3.6/encodings/ascii.py", line 26, in decode

    return codecs.ascii_decode(input, self.errors)[0]

UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 0: ordinal not in range(128)

glaubitz@suse-laptop:~/upstream/azure-activedirectory-library-for-python>

```



This is because of the Windows encoding of ```__init__.py``` contains a byte-order mark at the beginning of the file:



```

<U+FEFF>#------------------------------------------------------------------------------

```



simply converting ```__init__.py``` to standard Unix format fixes the problem:



```bash

glaubitz@suse-laptop:~/upstream/azure-activedirectory-library-for-python> dos2unix adal/__init__.py 

dos2unix: converting file adal/__init__.py to Unix format...

glaubitz@suse-laptop:~/upstream/azure-activedirectory-library-for-python> LANG=C python3 setup.py build

running build

running build_py

creating build

creating build/lib

creating build/lib/adal

copying adal/constants.py -> build/lib/adal

copying adal/adal_error.py -> build/lib/adal

copying adal/cache_driver.py -> build/lib/adal

copying adal/mex.py -> build/lib/adal

copying adal/xmlutil.py -> build/lib/adal

copying adal/authority.py -> build/lib/adal

copying adal/authentication_context.py -> build/lib/adal

copying adal/wstrust_response.py -> build/lib/adal

copying adal/self_signed_jwt.py -> build/lib/adal

copying adal/authentication_parameters.py -> build/lib/adal

copying adal/util.py -> build/lib/adal

copying adal/argument.py -> build/lib/adal

copying adal/user_realm.py -> build/lib/adal

copying adal/oauth2_client.py -> build/lib/adal

copying adal/token_cache.py -> build/lib/adal

copying adal/log.py -> build/lib/adal

copying adal/wstrust_request.py -> build/lib/adal

copying adal/token_request.py -> build/lib/adal

copying adal/__init__.py -> build/lib/adal

copying adal/code_request.py -> build/lib/adal

glaubitz@suse-laptop:~/upstream/azure-activedirectory-library-for-python>

```



This problem also affects the building of RPM packages. In fact, I stumbled over this issue when trying to build the python3 RPM package for ADAL.



Please consider plain UTF-8 for the source code encoding.

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