[janky] slightly more helpful error messages

Sometimes it can be a little confusing why Hubot is seemingly refusing to help you. 
It almost feels like you doesn't like you personally when things are down. 
We all know Hubot is really a classy individual, who performs gracefully under pressure and when things are flying apart. 
This was a little less than obvious when some of the snarky error messages.

/cc @Haacked @jnewland @technicalpickles