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'd like to add "people who are in space", "humans who are in space", etc.