interagent/pliny — pull request #75 by neilmiddleton (2014-09-15 12:40:16+00:00)
Title: Swap simple `gsub` for `tr`

TIL that `tr` is substantially faster than `gsub`. Whilst this commit won't
shake the earth it'll add a small something to performance.

`gsub` vs `tr`:

```
gsub 311878.2 (± 3.5%) i/s
tr 1573891.1 (± 4.6%) i/s
```