Show boosted user's avatar (#2518)

* Show boosted user's avatar

* add .status__avatar-boost

* margin

* apply to notifications too.

* account__avatar-boost

* Add inline prop to Avatar component

* Add AvatarOverlay component

* rename mixins.scss

* move files for latest master

* fixed for webpack

app/javascript/styles/components.scss

@@ -673,11 +673,33 @@ a.status__content__spoiler-link {
 }
 
 .account__avatar {
-  border-radius: 4px;
-  background: transparent no-repeat;
-  background-position: 50%;
-  background-clip: padding-box;
+  @include avatar-radius();
   position: relative;
+
+  &-inline {
+    display: inline-block;
+    vertical-align: middle;
+    margin-right: 5px;
+  }
+}
+
+.account__avatar-overlay {
+  @include avatar-size(48px);
+
+  &-base {
+    @include avatar-radius();
+    @include avatar-size(36px);
+  }
+
+  &-overlay {
+    @include avatar-radius();
+    @include avatar-size(24px);
+
+    position: absolute;
+    bottom: 0;
+    right: 0;
+    z-index: 1;
+  }
 }
 
 .account__relationship {