Add setup script (Marius Gedminas, issue jrfonseca#19).

setup.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+from setuptools import setup
+
+setup(
+    name='xdot',
+    version='0.4',
+    author='Jose Fonseca',
+    author_email='[email protected]',
+    url='http://code.google.com/p/jrfonseca/wiki/XDot',
+    description="Interactive viewer for Graphviz dot files",
+    long_description="""
+        xdot.py is an interactive viewer for graphs written in Graphviz's dot
+        language.
+
+        It uses internally the graphviz's xdot output format as an intermediate
+        format, and PyGTK and Cairo for rendering.
+
+        xdot.py can be used either as a standalone application from command
+        line, or as a library embedded in your python application.
+        """,
+    license="LGPL",
+
+    py_modules=['xdot'],
+    entry_points=dict(gui_scripts=['xdot=xdot:main']),
+
+    # This is true, but pointless, because easy_install PyGTK chokes and dies
+    #install_requires=['PyGTK', 'pycairo'],
+)