Revert to upstream tag-it

We have added a few enhancements of tag-it,
but since we have stopped using them, there is no point in keeping
them. Therefore I am reverting to the unmodified upstream version.

h/lib/tag-it.js

@@ -32,7 +32,6 @@
             caseSensitive     : true,
             fieldName         : 'tags',
             placeholderText   : null,   // Sets `placeholder` attr on input field.
-            keepPlaceholder   : false,  // Keep the 'placeholder' even when there is content
             readOnly          : false,  // Disables editing.
             removeConfirmation: false,  // Require confirmation to remove tags.
             tagLimit          : null,   // Max number of tags allowed (null for unlimited).
@@ -477,12 +476,6 @@
                 duringInitialization: duringInitialization
             });
 
-            // Now that we already have a tag,
-            // remove the placeholder from the input field
-            if (!this.options.keepPlaceholder) {
-              this.tagInput.attr("placeholder", "");
-            }
-
             if (this.options.showAutocompleteOnFocus && !duringInitialization) {
                 setTimeout(function () { that._showAutocomplete(); }, 0);
             }
@@ -525,12 +518,6 @@
                 this._trigger('afterTagRemoved', null, {tag: tag, tagLabel: this.tagLabel(tag)});
             }
 
-            // If no tags are left,
-            // re-add the placeholder text to the tag input field
-            if (!this.assignedTags().length && this.options.placeholderText && !this.options.keepPlaceholder) {
-                this.tagInput.attr('placeholder', this.options.placeholderText);
-            }
-
         },
 
         removeTagByLabel: function(tagLabel, animate) {
@@ -551,3 +538,4 @@
 
     });
 })(jQuery);
+