Lets the user specify number of items per row, fixes #7

Ussage: Under `displayData` for a given section, specify `layout: grid`, and then to set the number of horizontal items, use `itemCountX: 3`. You can also set `itemCountY` for number of items vertically, but this can be infered automatically if left blank.

src/views/Home.vue

@@ -25,8 +25,9 @@
         :displayData="getDisplayData(section)"
         :groupId="`section-${index}`"
         :items="filterTiles(section.items)"
+        :itemSize="itemSizeBound"
          @itemClicked="finishedSearching()"
-         :itemSize="itemSizeBound"
+         @change-modal-visibility="updateModalVisibility"
          :class="(filterTiles(section.items).length === 0 && searchValue) ? 'no-results' : ''"
       />
     </div>