SPACE LASERS! (closes #4)

jlrpg.ui.world.aliens
- finally got their own class
- spaceships now randomly fire on various points around the world
- there are 553 defines points for the ships to fire on
- though each ship only fires on points within a distance of 150
- (calculated once of course)

jQuery Addons
- randomElement: returns a random element from a typical $(...) query

jlrpg.debug
- functionality to gather location of shift+clicks into an
array-friendly list
- used for plotting various locations

underscore
- added some geometry methods: distance, angle, toRadians, toDegrees,
rotateAngleDegrees