PeopleInSpace: Assorted fixes 

Two changes:
	1. use retina icons
	2. add more triggers

There may be a third fix needed for the issue described at https://github.com/duckduckgo/zeroclickinfo-spice/pull/907#issuecomment-48850933. We can wait for that or I can just make a new PR later.

Issue number 965 is also open, but it looks like it will be a larger change and should probably be separate.
I don't know. I'm not the best person to ask about that. deferring to @jagtalon.

I think it would be cool if it could just cover some of the other common phrases people might type, like "who's in space", "who is in space", "is anyone in space"...not sure if there's others.