Character:move(): don't always compare with the player

This was terrible, but worked because monsters were never running into each
other.
Merge branch 'master' of github.com:xiongchiamiov/red-pill
Move monsters and civvies randomly.

Until the monsters see you, that is!

(They tend to get stuck on edges and each other.)

http://cl.ly/image/1V390k222T15