 	switch className {
 	case "_User":
 		path = "/users"
+	case "_Installation":
+		path = "/installations"
 	default:
 		path = "/classes/\(className)"
 	}

		return "\(inner)"
	}
}

		let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
		if let root = paths.first as? NSString {
			let file = root.stringByAppendingPathComponent(key)
			if let data = NSData(contentsOfFile: file) {
				println("loading from file \(file)")
				if let json = NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments, error: nil) as? [String: AnyObject] {
					return json
				}
