old_contents: import platform
  import sys
  
  __version_info__ = (0, 6, 7)
  __version__ = '.'.join(map(str, __version_info__))
  
  SERVER_ID = ','.join([platform.system(),
                        platform.release(),
                        'UPnP/1.0,Coherence UPnP framework',
                        __version__])
  
  
  try:
      from twisted import version as twisted_version
      from twisted.web import version as twisted_web_version
      from twisted.python.versions import Version
  except ImportError, exc:
      # log error to stderr, might be useful for debugging purpose
      sys.stderr.write("Twisted >= 2.5 and Twisted.Web >= 2.5 are required. " \
                       "Please install them.\n")
      raise
  
  try:
      if twisted_version < Version("twisted", 2, 5, 0):
          raise ImportError("Twisted >= 2.5 is required. Please install it.")
  
  except ImportError, exc:
      # log error to stderr, might be useful for debugging purpose
      for arg in exc.args:
          sys.stderr.write("%s\n" % arg)
      raise
  
new_contents: import platform
  import sys
  
  __version__ = "0.6.7.dev0"
  
  SERVER_ID = ','.join([platform.system(),
                        platform.release(),
                        'UPnP/1.0,Coherence UPnP framework',
                        __version__])
  
  
  try:
      from twisted import version as twisted_version
      from twisted.web import version as twisted_web_version
      from twisted.python.versions import Version
  except ImportError, exc:
      # log error to stderr, might be useful for debugging purpose
      sys.stderr.write("Twisted >= 2.5 and Twisted.Web >= 2.5 are required. " \
                       "Please install them.\n")
      raise
  
  try:
      if twisted_version < Version("twisted", 2, 5, 0):
          raise ImportError("Twisted >= 2.5 is required. Please install it.")
  
  except ImportError, exc:
      # log error to stderr, might be useful for debugging purpose
      for arg in exc.args:
          sys.stderr.write("%s\n" % arg)
      raise
  
subject: Switch to PEP 440 compliant version string and bump to 0.6.7.dev0.