Just pass along every attribute to the ing (except empty values)

lib/github/commands/foo.rst

@@ -0,0 +1,7 @@
+
+.. image:: https://scan.coverity.com/projects/621/badge.svg
+  :target: https://scan.coverity.com/projects/621
+  :alt: Coverity Scan Build Status
+
+.. image:: https://scan.coverity.com/projects/621/badge.svg
+  :alt: Coverity Scan Build Status

lib/github/commands/rest2html

@@ -93,21 +93,22 @@ class GitHubHTMLTranslator(HTMLTranslator):
     def depart_image(self, node):
       uri = node['uri']
       ext = os.path.splitext(uri)[1].lower()
-      # we need to swap RST's obj with img tags
+      # we need to swap RST's use of `object` with `img` tags
       # see http://git.io/5me3dA
       if ext == ".svg":
         # preserve essential attributes
         atts = {}
-        atts['src'] = node['uri']
-        atts['alt'] = node.get('alt', uri)
-        if 'width' in node:
-          atts['width'] = node['width']
-        if 'height' in node:
-          atts['height'] = node['height']
-
-        # toss off obj tag
+        for attribute, value in  node.attributes.items():
+          # we have no time for empty values
+          if value:
+            if attribute == "uri":
+              atts['src'] = value
+            else:
+              atts[attribute] = value
+
+        # toss off `object` tag
         self.body.pop()
-        # add on img with attributes
+        # add on `img` with attributes
         self.body.append(self.starttag(node, 'img', **atts))
       self.body.append(self.context.pop())