Adding icon for backhauls

[dmcken]

I would like an icon added for backhaul style devices, these are point-to-point wireless devices.

Something like this (taken from tessco's site):

Not sure where the original icons where acquired from to get one created for a pull request.

[mattieserver]

Hi,

Did you copy this from the site? If so, i am somewhat worried about the copyright of the icon.

[dreng]

As the posted image was taken from the website of tessco and very likely violates copyright I decided to remove the image. The posted image can be visited here.

[dreng]

Closed in favor of #240