added dist and build to gitignore
added dist and build to gitignore

claesenm/optunity,claesenm/optunity,MarkAWard/optunity,claesenm/optunity,MarkAWard/optunity,MarkAWard/optunity,chrinide/optunity,chrinide/optunity,chrinide/optunity,MarkAWard/optunity,claesenm/optunity,chrinide/optunity