added method to get artifacts file

lib/Gitlab/Api/Projects.php

@@ -126,15 +126,15 @@ public function remove($project_id)
     {
         return $this->delete('projects/'.$this->encodePath($project_id));
     }
-    
+
     /**
      * @param int $project_id
      * @return mixed
      */
     public function archive($project_id){
         return $this->post("projects/".$this->encodePath($project_id)."/archive");
     }
-    
+
     /**
      * @param int $project_id
      * @return mixed
@@ -165,6 +165,16 @@ public function build($project_id, $build_id)
         return $this->get($this->getProjectPath($project_id, 'builds/'.$this->encodePath($build_id)));
     }
 
+    /**
+     * @param $project_id
+     * @param $build_id
+     * @return mixed
+     */
+    public function buildArtifacts($project_id, $build_id)
+    {
+        return $this->get($this->getProjectPath($project_id, 'builds/'.$this->encodePath($build_id).'/artifacts'));
+    }
+
     /**
      * @param $project_id
      * @param $build_id

test/Gitlab/Tests/Api/ProjectsTest.php

@@ -289,6 +289,22 @@ public function shouldGetBuild()
         $this->assertEquals($expectedArray, $api->build(1, 2));
     }
 
+    /**
+     * @test
+     */
+    public function shouldGetBuildArtifacts(){
+        $expectedArray = array();
+
+        $api = $this->getApiMock();
+        $api->expects($this->once())
+            ->method('get')
+            ->with('projects/1/builds/2/artifacts')
+            ->will($this->returnValue($expectedArray))
+        ;
+
+        $this->assertEquals($expectedArray,$api->buildArtifacts(1, 2));
+    }
+
     /**
      * @test
      */