Changed the setup.py script to include and use the actual package version...

Changed the setup.py script to include and use the actual package version directly from Python module in local directory.

This change really simplifies package versioning, because value of only one __version__ variable needs to be updated and it will be used as version identifier of generated Python packages (wheels). Previous commit, that introduced automated package documentation already
 used this approach.

setup.py

 #!/usr/bin/python3
 # -*- coding: utf-8 -*-
 #-------------------------------------------------------------------------------
+# This file is part of idea-format package (https://pypi.python.org/pypi/idea-format).
+#
 # Copyright (c) since 2016, CESNET, z. s. p. o.
-# Authors: Pavel Kácha <pavel.kacha@cesnet.cz>
-#          Jan Mach <jan.mach@cesnet.cz>
+# Author: Pavel Kácha <pavel.kacha@cesnet.cz>
 # Use of this source is governed by an ISC license, see LICENSE file.
 #-------------------------------------------------------------------------------
 
@@ -11,23 +12,31 @@
 #   https://packaging.python.org/distributing/
 #   http://python-packaging-user-guide.readthedocs.io/distributing/
 
+import sys
+import os
+
 # Always prefer setuptools over distutils
 from setuptools import setup, find_packages
 # To use a consistent encoding
 from codecs import open
-from os import path
 
+#
+# Import local version of typedcols library, so that we can insert correct version
+# number into documentation.
+#
+sys.path.insert(0, os.path.abspath('.'))
 import idea
 
-here = path.abspath(path.dirname(__file__))
+#-------------------------------------------------------------------------------
+
+here = os.path.abspath(os.path.dirname(__file__))
 
 # Get the long description from the README file
-with open(path.join(here, 'README.rst'), encoding='utf-8') as f:
+with open(os.path.join(here, 'README.rst'), encoding='utf-8') as f:
     long_description = f.read()
 
 setup(
     name = 'idea-format',
-    #version = '0.1.8',
     version = idea.__version__,
     description = 'Python library for working with IDEA messages.',
     long_description = long_description,