Make thinks more useful

Extract functionality from program.Program to api, so it can be used
from other python code.
And instead of adding predefined urls to root_urlconf, we should
/mount/ apps into a django project.

src/django_deploy/tests/test_program.py

@@ -65,8 +65,8 @@ class ProgramTestCase(unittest.TestCase):
 
     def test_create_existing_project_dir(self):
         exitval = self._program(argv=['-c', self._project_dir])
-        self.assertEqual(os.EX_NOPERM, exitval, 'program() does not return os.EX_NOPERM'
-                                                ' when project directory is not empty')
+        self.assertEqual(os.EX_SOFTWARE, exitval, 'program() does not return os.EX_SOFTWARE'
+                                                  ' when project directory is not empty')
 
     def test_enable_django_deploy(self):
         project_dir = os.path.join(str(self.tmpdir), 'pure_django')