MP Mini Select Bed Modular Mounting System

I modified the [MP Mini Select Bed Mount for Camera](http://www.thingiverse.com/thing:2684992) by rukeyser so it fits the left side of the bed. Further it was mixed with the [Modular Mounting System](http://www.thingiverse.com/thing:2194278) by yyh1002 so it is easier to attach accessories.