Merge pull request #60 from jpetazzo/master

Update busybox + provide tags for variants

library/busybox

@@ -1,3 +1,8 @@
 # maintainer: Jérôme Petazzoni <[email protected]> (@jpetazzo)
 
-latest: git://github.com/jpetazzo/docker-busybox@02a13fddf5fa8e1c0e1427526dd89f63be918234
+buildroot-2013.08.1: git://github.com/jpetazzo/docker-busybox@02a13fddf5fa8e1c0e1427526dd89f63be918234
+buildroot-2014.02: git://github.com/jpetazzo/docker-busybox@d595e94020a3a420a05d4531cf8f75b71a3fd8e8
+latest: git://github.com/jpetazzo/docker-busybox@d595e94020a3a420a05d4531cf8f75b71a3fd8e8
+ubuntu-12.04: git://github.com/jpetazzo/docker-busybox@b03e2e24dfca86b2223a6e493a649b699c460e99
+ubuntu-14.04: git://github.com/jpetazzo/docker-busybox@93811b9206948a2bc38679ffff4af8a2267aa8c7
+