Use get() instead of getS3method() for R < 3.3

[krlmlr]

Fixes #202. Tested locally on R 3.2.5 and R 3.3-patched.

[krlmlr]

Wanted to add NEWS entry, but release branch doesn't seem to be merged yet.

[itsdalmo]

Beginner question here; Why not use a if statement here which dep. on R version? Is it because of performance or something else? Also, how long will you have to wait before exchanging get with getS3method and bumping the R version dependency (if ever)?

[krlmlr]

I just went the path of least resistance here. The code is hit by about 10 tests, so if it ever breaks, we may think again about updating it.

[hadley]

Just updated the release status

[krlmlr]

Are you, too, now receiving GitHub notifications when somebody pushes to an active pull request?

[hadley]

Thanks!

And yes - it seems to be a new github feature. I haven't seen it announced yet though.