nat.utils 0.4.1
===============
* add is.gzip function
* RunCmdForNewerInput now has a Force option (FALSE by default) that can be
  used to override mtime checks and run the command if possible.
* dev: upgrade to roxygen2 v4

nat.utils 0.4
=============
* RunCmdForNewerInput can now evaluate expressions in the context of the caller
  (so that variables can be used properly)
* tests: fix a test failure for latest version of testthat
* dev: add travis continuous integration, update docs with roxygen2 v3.1

nat.utils 0.3
=============
* deprecate file.hardlink in favour of base::file.link
* prepare CRAN release

nat.utils 0.2
=============
* add zipinfo() and zipok() functions (and tests)

nat.utils 0.1
=============
* First version on github
* translates main functions from AnalysisSuite Utils/OSUtils.R
