Add message protocol colors to received messages.

// FREEBIE

![img_20141008_004429](https://cloud.githubusercontent.com/assets/770029/4551718/dd6b1fca-4e75-11e4-8583-13f8487175ce.jpg)

Sorry for just barging in with this one. Any feedback is appreciated.

I tried to keep it subtle.
I often find myself checking for the protocol the other person uses, so I can answer them on the appropriate channel. Mostly this is when they have their mobile internet turned off, for various reasons (e.g. limited data plan, roaming, battery life concerns)