Adding having() support to the Fluent query builder.

Signed-off-by: Ben Corlett <bencorlett@me.com>

laravel/database/query.php

@@ -70,6 +70,13 @@ class Query {
 	 */
 	public $groupings;
 
+	/**
+	 * The HAVING clauses.
+	 *
+	 * @var array
+	 */
+	public $havings;
+
 	/**
 	 * The ORDER BY clauses.
 	 *
@@ -475,6 +482,22 @@ class Query {
 		return $this;
 	}
 
+	/**
+	 * Add a having to the query.
+	 *
+	 * @param  string  $column
+	 * @param  string  $operator
+	 * @param  mixed   $value
+	 */
+	public function having($column, $operator, $value)
+	{
+		$this->havings[] = compact('column', 'operator', 'value');
+
+		$this->bindings[] = $value;
+
+		return $this;
+	}
+
 	/**
 	 * Add an ordering to the query.
 	 *