FEATURE: correctly store width and height on uploads

Previously we used width and height for thumbnails, new code ensures

1. We auto correct width and height
2. We added extra columns for thumbnail_width and height, this is determined
 by actual upload and no longer passed in as a side effect
3. Optimized Image now stores filesize which can be used for analysis, decisions

Also

- fixes Android image manifest as a side effect
- fixes issue where a thumbnail generated that is smaller than the upload is no longer used

test/javascripts/lib/utilities-test.js.es6

@@ -161,8 +161,8 @@ var testUploadMarkdown = function(filename) {
   return getUploadMarkdown({
     original_filename: filename,
     filesize: 42,
-    width: 100,
-    height: 200,
+    thumbnail_width: 100,
+    thumbnail_height: 200,
     url: "/uploads/123/abcdef.ext"
   });
 };