install sample config files in a standard location

This means they'll automatically be installed in the right place by the
packaging processes of various UNIX distros, and then that makes it easy
for the upcoming 'fdroid init' to find them.

setup.py

@@ -11,6 +11,11 @@ setup(name='FDroidServer',
       url='http://f-droid.org',
       packages=['fdroidserver'],
       scripts=['fdroid'],
+      data_files=[
+        ('share/doc/fdroidserver/examples',
+         ['config.buildserver.py', 'config.sample.py', 'makebs.config.sample.py',
+          'fdroid-icon.png']),
+        ],
       install_requires=[
         'python-magic',
         'PIL',