Replace utf8 character ' with its ascii counterpart, makes bdist_rpm happy on CentOS 7

[nevun]

Before this:

$ python setup.py bdist_rpm --spec-only
warning: pypandoc module not found, could not convert Markdown to RST
running bdist_rpm
running egg_info
creating djangorestframework.egg-info
writing djangorestframework.egg-info/PKG-INFO
writing top-level names to djangorestframework.egg-info/top_level.txt
writing dependency_links to djangorestframework.egg-info/dependency_links.txt
writing manifest file 'djangorestframework.egg-info/SOURCES.txt'
reading manifest file 'djangorestframework.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no previously-included files matching '__pycache__' found under directory '*'
warning: no previously-included files matching '*.py[co]' found under directory '*'
writing manifest file 'djangorestframework.egg-info/SOURCES.txt'
creating dist
Traceback (most recent call last):
  File "setup.py", line 103, in <module>
    'Topic :: Internet :: WWW/HTTP',
  File "/usr/lib64/python2.7/distutils/core.py", line 152, in setup
    dist.run_commands()
  File "/usr/lib64/python2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/usr/lib64/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "/usr/lib/python2.7/site-packages/setuptools/command/bdist_rpm.py", line 28, in run
    _bdist_rpm.run(self)
  File "/usr/lib64/python2.7/distutils/command/bdist_rpm.py", line 296, in run
    self._make_spec_file()),
  File "/usr/lib/python2.7/site-packages/setuptools/command/bdist_rpm.py", line 59, in _make_spec_file
    for line in spec
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 5982: ordinal not in range(128)
$

After:

$ python setup.py bdist_rpm --spec-only
warning: pypandoc module not found, could not convert Markdown to RST
running bdist_rpm
running egg_info
writing djangorestframework.egg-info/PKG-INFO
writing top-level names to djangorestframework.egg-info/top_level.txt
writing dependency_links to djangorestframework.egg-info/dependency_links.txt
reading manifest file 'djangorestframework.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no previously-included files matching '__pycache__' found under directory '*'
warning: no previously-included files matching '*.py[co]' found under directory '*'
writing manifest file 'djangorestframework.egg-info/SOURCES.txt'
writing 'dist/djangorestframework.spec'
$

[tomchristie]

Fair enough