Set STATIC_ROOT for serving static assets using Whitenoise

This is one of the few requirements for whitenoise to just work.

See http://whitenoise.evans.io/en/stable/django.html

(This had been done in cdcb34f, but probably lost in a master merge)

mygpo/settings.py

@@ -86,7 +86,7 @@ def get_intOrNone(name, default):
 
 # Static Files
 
-STATIC_ROOT = 'staticfiles'
+STATIC_ROOT = os.path.join(BASE_DIR, 'staticfiles')
 STATIC_URL = '/static/'
 
 STATICFILES_DIRS = (os.path.abspath(os.path.join(BASE_DIR, '..', 'static')),)