Changed warpRNG to better fullfill RNG reqs

Reseeding a random number each operation is worse - leeding to several
times the same sequence. Also uses string.gethashcode now to actually
get a good hash from a string (as a consequence you could type the solar
system by name now).
Merge pull request #11 from pulli23/master

Changed warpRNG to better fullfill RNG reqs