Allow see project build status in cctray xml format

Refactoring is done for BuildStatus information.
- Fixed all phpcs, phpmd errors
- Added test for my code (hurray 100 tests already :D)

Closed #705

PHPCI/Store/BuildStore.php

@@ -107,6 +107,27 @@ class BuildStore extends BuildStoreBase
         }
     }
 
+    /**
+     * Returns all registered branches for project
+     *
+     * @param $projectId
+     * @return array
+     * @throws \Exception
+     */
+    public function getBuildBranches($projectId)
+    {
+        $query = 'SELECT DISTINCT `branch` FROM `build` WHERE `project_id` = :project_id';
+        $stmt = Database::getConnection('read')->prepare($query);
+        $stmt->bindValue(':project_id', $projectId);
+
+        if ($stmt->execute()) {
+            $res = $stmt->fetchAll(\PDO::FETCH_COLUMN);
+            return $res;
+        } else {
+            return array();
+        }
+    }
+
     /**
      * Return build metadata by key, project and optionally build id.
      * @param $key