packer/rpc: accept/dial stream IDs are unique [GH-727]
post-procssor/vagrant: return proper artifact
packer/rpc: fix data race by acquiring wrong locks in MuxConn
packer/rpc: use a pointer for maps to avoid race
packer: Tempaltes understand "pause_before" in provisioners
packer: PausedProvisioner
packer: say the pause before next provisioner
packer: configure the build with the paused provisioner
website: update for pause_before
Merge pull request #739 from mitchellh/f-prov-pause-before

Provisioner "pause_before" meta-parameter
Update CHANGELOG
packer/rpc: missing format for muxconn
packer/rpc: don't use stream ID zero [GH-738]
packer/rpc: if stream ID 0 is used, paic
packer/rpc: communicator shouldn't conncet to ID 0
builder/amazon/chroot: mount in device-specific places
builder/amazon: alphabetize
builder/virtualbox: move to iso/ folder
builder/virtualbox/iso: rename package
plugin/builder-virtualbox: new package