Fix windows wheels. Resolves #28. Resolves #49

[asottile]

From http://stevedower.id.au/blog/building-for-python-3-5-part-two/

[asottile]

Seems fixed, I'll release a new version with this fix:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\IEUser>virtualenv venv
New python executable in venv\Scripts\python.exe
Installing setuptools, pip, wheel...done.

C:\Users\IEUser>venv\Scripts\activate
(venv) C:\Users\IEUser>pip install libsass
Collecting libsass
  Downloading libsass-0.9.2-cp27-none-win32.whl (400kB)
    100% |################################| 401kB 1.3MB/s
Collecting six (from libsass)
  Downloading six-1.10.0-py2.py3-none-any.whl
Installing collected packages: six, libsass
Successfully installed libsass-0.9.2 six-1.10.0

(venv) C:\Users\IEUser>python
Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import libsass
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named libsass
>>> import sass
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\IEUser\venv\lib\site-packages\sass.py", line 26, in <module>
    from _sass import OUTPUT_STYLES, compile_filename, compile_string
ImportError: DLL load failed: The specified module could not be found.
>>> exit()

(venv) C:\Users\IEUser>pip uninstall libsass
Uninstalling libsass-0.9.2:
  c:\users\ieuser\venv\lib\site-packages\_sass.pyd
  c:\users\ieuser\venv\lib\site-packages\libsass-0.9.2.dist-info\description.rst
  c:\users\ieuser\venv\lib\site-packages\libsass-0.9.2.dist-info\entry_points.txt
  c:\users\ieuser\venv\lib\site-packages\libsass-0.9.2.dist-info\metadata
  c:\users\ieuser\venv\lib\site-packages\libsass-0.9.2.dist-info\metadata.json
  c:\users\ieuser\venv\lib\site-packages\libsass-0.9.2.dist-info\record
  c:\users\ieuser\venv\lib\site-packages\libsass-0.9.2.dist-info\top_level.txt
  c:\users\ieuser\venv\lib\site-packages\libsass-0.9.2.dist-info\wheel
  c:\users\ieuser\venv\lib\site-packages\sass.py
  c:\users\ieuser\venv\lib\site-packages\sass.pyc
  c:\users\ieuser\venv\lib\site-packages\sassc.py
  c:\users\ieuser\venv\lib\site-packages\sassc.pyc
  c:\users\ieuser\venv\lib\site-packages\sasstests.py
  c:\users\ieuser\venv\lib\site-packages\sasstests.pyc
  c:\users\ieuser\venv\lib\site-packages\sassutils\__init__.py
  c:\users\ieuser\venv\lib\site-packages\sassutils\__init__.pyc
  c:\users\ieuser\venv\lib\site-packages\sassutils\builder.py
  c:\users\ieuser\venv\lib\site-packages\sassutils\builder.pyc
  c:\users\ieuser\venv\lib\site-packages\sassutils\distutils.py
  c:\users\ieuser\venv\lib\site-packages\sassutils\distutils.pyc
  c:\users\ieuser\venv\lib\site-packages\sassutils\wsgi.py
  c:\users\ieuser\venv\lib\site-packages\sassutils\wsgi.pyc
  c:\users\ieuser\venv\scripts\sassc.exe
  c:\users\ieuser\venv\scripts\sassc.py
  c:\users\ieuser\venv\scripts\sassc.pyc
Proceed (y/n)? y
  Successfully uninstalled libsass-0.9.2

(venv) C:\Users\IEUser>pip install https://ci.appveyor.com/api/buildjobs/tsbhfwvgju69nku5/artifacts/dist/libsass-0.9.2-cp27-none-win32.whl
Collecting libsass==0.9.2 from https://ci.appveyor.com/api/buildjobs/tsbhfwvgju69nku5/artifacts/dist/libsass-0.9.2-cp27-none-win32.whl
  Downloading https://ci.appveyor.com/api/buildjobs/tsbhfwvgju69nku5/artifacts/dist/libsass-0.9.2-cp27-none-win32.whl (526kB)
    100% |################################| 528kB 682kB/s
Requirement already satisfied (use --upgrade to upgrade): six in c:\users\ieuser\venv\lib\site-packages (from libsass==0.9.2)
Installing collected packages: libsass
Successfully installed libsass-0.9.2

(venv) C:\Users\IEUser>python
Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sass
>>> exit()

(venv) C:\Users\IEUser>