Added static getPathWithNamespace(String, String) method (#380).

src/main/java/org/gitlab4j/api/models/Project.java

@@ -646,4 +646,15 @@ public class Project {
     public String toString() {
         return (JacksonJson.toJsonString(this));
     }
+
+    /**
+     * Formats a fully qualified project path based on the provided namespace and project path.
+     *
+     * @param namespace the namespace, either a user name or group name
+     * @param path the project path
+     * @return a fully qualified project path based on the provided namespace and project path
+     */
+    public static final String getPathWithNammespace(String namespace, String path) {
+        return (namespace.trim() + "/" + path.trim());
+    }
 }