Use the module name for tarball installation, if specified, with a test.

Fixes #48

changes/cli.py

@@ -31,6 +31,7 @@
   --noinput                  To be used in conjuction with one of the version
                              increment options above, this option stops
                              `changes` from confirming the new version number.
+  --module-name=<module>     If your module and package aren't the same
   --debug                    Debug output.
 
 The commands do the following:

changes/packaging.py

@@ -22,10 +22,11 @@ def install():
     result = shell.handle_dry_run(sh.python, ('setup.py', 'clean', 'sdist'))
     if result:
         tmp_dir = make_virtualenv()
+        module_name = config.arguments.get('--module-name') or app_name
         try:
             virtualenv.install_sdist(
                 config.arguments['<app_name>'],
-                'dist/%s-%s.tar.gz' % (app_name, new_version),
+                'dist/%s-%s.tar.gz' % (module_name, new_version),
                 '%s/bin/python' % tmp_dir
             )
             log.info('Successfully installed %s sdist', app_name)

tests/test_packaging.py

@@ -8,6 +8,11 @@ def test_install(self):
         config.arguments['--dry-run'] = True
         packaging.install()
 
+    def test_install_with_module_name(self):
+        config.arguments['--dry-run'] = True
+        config.arguments['--module-name'] = 'thing'
+        packaging.install()
+
     def test_make_virtualenv(self):
         packaging.make_virtualenv()