add native routine registration

[edzer]

No description provided.

[jameshiebert]

Thanks for taking a crack at this! I was unaware of the advantages of registering 'native routines', so I'm glad you saw that message on R-devel.

The tests for this PR failed for a reason unrelated to the code itself... the TravisCI build environment is currently in flux with the EOL of Ubuntu:precise.

I have upgraded the build environment for this repo, so could you rebase your changes against the master branch and ensure that the tests pass correctly?

[edzer]

I also noted a regression on CRAN checks, with OSX release. This takes affects downstream packages too; it may have to do with the new R release, but we probably need to contact CRAN (Simon Urbanek) if it persists.

[jameshiebert]

No, we shouldn't need to contact CRAN about this at all. Pretty sure that it's just related to the TravisCI build environment. I already configured Rudunits2's build to use the new TravisCI build environment (as one can see here). So you should simply need to rebase or merge your master with mine to pick up those changes.

[edzer]

Great, thanks!