Add a setup.py script for installation

Let a user install pymodoro if they like with:
    python setup.py install

pymodoro.py

@@ -454,6 +454,9 @@ def notify(self, strings):
             pass
 
 
-if __name__ == "__main__":
+def main():
     pymodoro = Pymodoro()
     pymodoro.run()
+
+if __name__ == "__main__":
+    main()

setup.py

@@ -0,0 +1,14 @@
+import os
+import glob
+from setuptools import setup
+
+datadir = 'data'
+datafiles = [(datadir, [f for f in glob.glob(os.path.join(datadir, '*'))])]
+
+setup(
+    name='pymodoro',
+    version='0.1',
+    py_modules=['pymodoro'],
+    data_files=datafiles,
+    entry_points={"console_scripts": ["pymodoro = pymodoro:main"]},
+)