Change LOCAL_UPLOAD_DIR to 'uploads' in development.

Fixes #488.

.gitignore

@@ -41,3 +41,4 @@ tools/emoji_dump/bitmaps/
 tools/emoji_dump/*.ttx
 tools/phantomjs
 node_modules
+uploads/

zproject/settings.py

@@ -83,6 +83,7 @@ else:
     # For the Dev VM environment, we use the same settings as the
     # sample local_settings.py file, with a few exceptions.
     from .local_settings_template import *
+    LOCAL_UPLOADS_DIR = 'uploads'
     EXTERNAL_HOST = 'localhost:9991'
     ALLOWED_HOSTS = ['localhost']
     AUTHENTICATION_BACKENDS = ('zproject.backends.DevAuthBackend',)