Guard `{-# LANGUAGE Safe #-}` by `base>=4.4.1`

Modules in `base-4.4.0.0` weren't "safe" to import yet.

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
`M-x untabify` & `M-x delete-trailing-whitespace`

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
Refactor & modernize `.cabal` to `cabal-version>=1.10`

`old-locale` has been verified to compile cleanly back to GHC 6.12.3,
which is reflected in the updated `base-depends` constraint.

Note: this also performs the overdue version bump to version 1.0.0.6

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
Add `README.md` and `.travis.yml` script

This enables testing (or rather testing the packages builds) for all
released GHC versions this package is expected to work with.

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>