Merge pull request #444 from rocker-org/master

Update r-base with apt-pinning

library/r-base

@@ -1,6 +1,6 @@
 # maintainer: "Carl Boettiger" <[email protected]> (@cboettig)
 # maintainer: "Dirk Eddelbuettel" <[email protected]> (@eddelbuettel)
 
-latest: git://github.com/rocker-org/rocker@105fca2b42051c5cd0894da31839c99a9b7de320 debian/r-base
-3.1.2: git://github.com/rocker-org/rocker@105fca2b42051c5cd0894da31839c99a9b7de320 debian/r-base
+latest: git://github.com/rocker-org/rocker@fa244c6a6010d41fca568d2469be681959a1f3c4 r-base
+3.1.2: git://github.com/rocker-org/rocker@fa244c6a6010d41fca568d2469be681959a1f3c4 r-base