root_fs now comes from rootfs_lucid64 package

/var/vcap/stemcell_base.tar.gz is being removed from the base stemcell
add different aws instance types for prod and staging [#49424769]
Merge pull request #78 from drnic/remove_old_rootfs

root_fs now comes from rootfs_lucid64 package
add different aws vm count for prod and staging [#49424769]