Add option to disable filtering options by the search text

If the filtering is done on the server-side or the search text isn't
contained in the option text then this should be set to `false`.

src/components/Select.vue

@@ -504,6 +504,16 @@
         default: false
       },
 
+      /**
+       * When true, existing options will be filtered
+       * by the search text.
+       * @type {Boolean}
+       */
+      filterOptions: {
+        type: Boolean,
+        default: true
+      },
+
       /**
        * User defined function for adding Options
        * @type {Function}
@@ -887,6 +897,9 @@
        * @return {array}
        */
       filteredOptions() {
+        if (this.filterOptions === false) {
+          return this.mutableOptions
+        }
         let options = this.mutableOptions.filter((option) => {
           if (typeof option === 'object' && option.hasOwnProperty(this.label)) {
             return option[this.label].toLowerCase().indexOf(this.search.toLowerCase()) > -1