0.3.12 no user-visible changes. Fixes unit test issue with recent release of testthat

CHANGES IN VERSION 0.3.12
-------------------------

USER-VISIBLE CHANGES

	- No user-visible changes. All future compatibility changes.

BUG FIXES

	- Unit test changes to work with upcoming R release and new testthat
version.

	- This solves Issue 4: https://github.com/joey711/biom/issues/4