Change 'bob' references to 'hamming'
Change 'bob' references to 'hamming'

Modifying hamming/hamming_test.rb error output to match the exercise name change
from bob to hamming.

fixes #50

remcopeereboom/xruby,alexbrinkman/xruby,Insti/xruby,NobbZ/xruby,dalexj/xruby,darrencauthon/xruby,gchan/xruby,kickinbahk/xruby,tommyschaefer/xruby,rashmiagar/exercism,kotp/xruby,Calvyn82/xruby,Calvyn82/word_count,kickinbahk/xruby,kotp/xruby,NeimadTL/ruby,Calvyn82/word_count,rashmiagar/exercism,wobh/xruby,alexbrinkman/xruby,Insti/xruby,tommyschaefer/xruby,NeimadTL/ruby,samilokan/xruby,remcopeereboom/xruby,darrencauthon/xruby,jdsayle/xruby,Insti/exercism-ruby,gchan/xruby,exercism/xruby,Calvyn82/xruby,exercism/xruby,mamenama/xruby,NobbZ/xruby,Insti/exercism-ruby,jdsayle/xruby,samilokan/xruby,dalexj/xruby,wobh/xruby,NeimadTL/ruby,mamenama/xruby,Insti/exercism-ruby