Add Fritzing part for Servo Module

[Frijol]

Find schematics etc. at https://tessel.io/opensource

[rwaldron]

Need to make sure that the component uses the same dimensions, like:

Source for that is here: http://johnny-five.io/img/breadboard/temperature-SI7020.fzz

And... https://github.com/rwaldron/tessel-io/tree/master/fritzing

[Frijol]

oh nice, didn't realize you'd done that! relevant #25

[rwaldron]

When I get to Boston I will upload the svgs so the component layers can be reused in other components