Allow getting one media item through api plugin

diff --git a/mediagoblin/plugins/api/views.py b/mediagoblin/plugins/api/views.py
index 69fae7b..e239f7e 100644
--- a/mediagoblin/plugins/api/views.py
+++ b/mediagoblin/plugins/api/views.py
@@ -111,6 +111,11 @@ def get_entries(request):
     # TODO: Make it possible to fetch unprocessed media, or media in-processing
     entries = entries.filter_by(state=u'processed')
 
+    # allow getting one entry
+    m_id = int(request.GET.get('id') or 0)
+    if m_id:
+        entries = entries.filter_by(id=m_id)
+
     # TODO: Add sort order customization
     entries = entries.order_by(request.db.MediaEntry.created.desc())