How to tie thunderbolt and power together for Macbook retina docking in Thunderbolt display?
After a little searching I found a few options


The Macbook Pro Dock Cable from Prototype Asia.. This looks like a very cheap clipping option. However, the company or individual selling it seems pretty small-scale.
ZenDock is a simple docking solution that makes a single left side plug for power and other thuderbolt ports. At time of posting (July 2014), it is only available on pre-order.
LandingZone 2.0 Pro provides a docking and security solution that allows for one-click entry of power and thunderbolt.