Add spinner slot to customize spinner as loading animation

Author: PeachScript

src/components/InfiniteLoading.vue

@@ -1,6 +1,8 @@
 <template>
   <div class="infinite-loading-container">
-    <i :class="spinnerType" v-show="isLoading"></i>
+    <slot name="spinner">
+      <i :class="spinnerType" v-show="isLoading"></i>
+    </slot>
     <div class="infinite-status-prompt" v-show="!isLoading && isComplete && isFirstLoad">
       <slot name="no-results">No results :(</slot>
     </div>