Added Python package setup and version management

.gitattributes

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+artella/plugins/getdependencies/_version.py export-subst

MANIFEST.in

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+include versioneer.py
+include artella-plugin.json
+include artella/plugins/getdependencies/_version.py
+recursive-include artella/plugins/getdependencies/resources/* *.*
+recursive-exclude * *.py[co]

artella/plugins/getdependencies/__version__.py

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+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Version module for artella-plugins-getdependencies
+"""
+
+from __future__ import print_function, division, absolute_import
+
+__version__ = None
+
+
+def get_version():
+    global __version__
+    if __version__:
+        return __version__
+
+    from ._version import get_versions
+    __version__ = get_versions()['version']
+    del get_versions
+
+    return __version__