Cosmetic: cleanup imports

I have been cleaning the import a bit (mainly because I am experiencing strange build errors with `language-puppet` even in a cabal sandbox after the Arch OS upgrade of this package).

Anyhow I hope this tiny pull request is actually useful.

As a note,`Attoparsec` is using the `scientific` package to parse numbers since 0.11.Would you be interested in upgrading `attoparsec` ? It probably breaks compatibility with previous `attoparsec` versions.