Add OEmbed iframe HTML, convert emojis on public pages, increase size of attachment thumbnails

app/assets/stylesheets/application.scss

@@ -114,6 +114,18 @@ body {
     padding: 0;
   }
 
+  &.embed {
+    background: transparent;
+    margin: 0;
+
+    .container {
+      position: absolute;
+      width: 100%;
+      height: 100%;
+      overflow: hidden;
+    }
+  }
+
   @media screen and (max-width: 360px) {
     padding-bottom: 0;
   }

app/assets/stylesheets/stream_entries.scss

@@ -232,3 +232,24 @@
     }
   }
 }
+
+.embed {
+  .activity-stream {
+    border-radius: 4px;
+    box-shadow: none;
+
+    .entry {
+      &:last-child {
+        border-radius: 0 0 4px 4px;
+      }
+
+      &:first-child {
+        border-radius: 4px 4px 0 0;
+
+        &:last-child {
+          border-radius: 4px;
+        }
+      }
+    }
+  }
+}