Made the fact slightly shorted in bin/test_1.rb

* now a fact takes about 250 Bytes in the to_CSV result
* succesfully wrote 10M facts (in 1000s) using ruby 1.9.3-p429 Linux x86_64
* failed on ruby 2.0.0-p195 (quadratic increase of time with number of facts)
* failed on jruby 1.7.4 (java.lang.IllegalArgumentException)