setup: Simplify release process using "versioneer"

Release process is now as simple as tagging a release, there
is no need to manually updates version in __init__.py and setup.py

Most of the files enabling this process have been generated and/or
updated after:
1) pip install versioneer
2) adding "versioneer" section to setup.cfg
3) running "versioneer install"

For more details, see https://github.com/warner/python-versioneer/

Author: jcfr

.gitattributes

@@ -0,0 +1 @@
+cmake/_version.py export-subst

MANIFEST.in

@@ -2,3 +2,5 @@ include CMakeLists.txt
 include requirements-dev.txt
 
 recursive-include src *
+include versioneer.py
+include cmake/_version.py

cmake/__init__.py

@@ -3,6 +3,11 @@
 import subprocess
 import sys
 
+from ._version import get_versions
+
+__version__ = get_versions()['version']
+del get_versions
+
 CMAKE_DATA = os.path.join(os.path.dirname(__file__), 'data')
 
 if platform.system().lower() == "darwin":

cmake/_version.py

@@ -0,0 +1,6 @@
+[versioneer]
+VCS = git
+versionfile_source = cmake/_version.py
+versionfile_build = cmake/_version.py
+style = pep440-post
+tag_prefix = ''

setup.cfg

@@ -1,11 +1,14 @@
 #!/usr/bin/env python
 
+import versioneer
+
 from skbuild import setup
 
 setup(
     name='cmake',
 
-    version='0.1.0',
+    version=versioneer.get_version(),
+    cmdclass=versioneer.get_cmdclass(),
 
     author='Jean-Christophe Fillion-Robin',
     author_email='jchris.fillionr@kitware.com',