* I do not use 1.9.3
* Also keeping them in each file increases mental overhead (true it *can* be autoamted)
* None of the files encodes NON ASCII chars.
* I do not expect it makes any difference, since nobody programmatically
will consume strings generated by mutant under the assumption they are UTF-8 encoded.
* 1.9.3 Users have to deal with the encoding fuckup under ruby anyways.
Mutation operators should *always* mutate to a less powerfull structure
/ less complex semantics. To force tests to prove complex semantics are
needed. The mutation removed with that commit violates that principle.
