Implement discussion composition and creation

ember/app/components/ui/controls/text-input.js

@@ -0,0 +1,18 @@
+import Ember from 'ember';
+
+export default Ember.TextField.extend({
+	didInsertElement: function() {
+		var component = this;
+		this.$().on('input', function() {
+			var empty = !$(this).val();
+			if (empty) {
+				$(this).val(component.get('placeholder'));
+			}
+			$(this).css('width', 0);
+			$(this).width($(this)[0].scrollWidth);
+			if (empty) {
+				$(this).val('');
+			}
+		});
+	}
+});