Updated to RELEASE from RC4.
Install all virtio kernel modules
Debian 7.3.0 support
 * updated iso url and checksum
 * Use new {virtualbox,vmware}-iso builder names (packer 0.5.0 change)
Allow `packer_cache` to be symlink

The trailing slash ignores only directories.
Merge pull request #161 from tmatilai/packer_cache_symlink

Allow `packer_cache` to be symlink
Merge pull request #159 from juliandunn/freebsd-10

Finalize FreeBSD 10 support
Merge pull request #160 from fadenb/feat/debian-7.3.0

Debian 7.3.0 support