Add total() to ORM\Query.

This method makes it much easier to get COUNT(*) for queries. This will
make removing paginateCount() from PaginatorComponent.

Cake/ORM/Query.php

@@ -616,6 +616,20 @@ public function first() {
 		return $this->_results->one();
 	}
 
+/**
+ * Return the COUNT(*) for for the query.
+ *
+ * This method will replace the selected fields with a COUNT(*)
+ * and execute the queries returning the number of rows.
+ *
+ * @return integer
+ */
+	public function total() {
+		return $this->select(['count' => $this->count('*')], true)
+			->hydrate(false)
+			->first()['count'];
+	}
+
 /**
  * Toggle hydrating entites.
  *

Cake/Test/TestCase/ORM/QueryTest.php

@@ -1351,4 +1351,23 @@ public function testHydrateBelongsToCustomEntity() {
 		$this->assertInstanceOf($authorEntity, $first->author);
 	}
 
+/**
+ * Test getting totals from queries.
+ *
+ * @return void
+ */
+	public function testTotal() {
+		$table = TableRegistry::get('articles');
+		$result = $table->find('all')->total();
+		$this->assertEquals(3, $result);
+
+		$query = $table->find('all')
+			->where(['id >' => 1]);
+		$result = $query->total();
+		$this->assertEquals(2, $result);
+
+		$result = $query->execute();
+		$this->assertEquals(['count' => 2], $result->one());
+	}
+
 }