Google has now allowed android users to lock, erase the data, ring, track their android devices remotely using the web. You can simply do it by logging with the same email id as used in android device and open this link, https://www.google.com/android/devicemanager.
By default LOCK and ERASE Feature is disabled, casino You can enable it by going to
Google Settings -> Android Device Manger -> and Tick Allow remote lock and factory reset right. Remember after enabling it, use it carefully, you may end up losing everything on your device.