eris-platform - the template doesn't install eris

[eris-platform](https://github.com/Azure/azure-quickstart-templates/tree/master/eris-platform)
### Issue Details

Hi @compleatang!

I tried to run a new machine with the Eris template, but it hasn't installed `eris`:

```
azureuser@ether-camp-eris:~$ eris
No command 'eris' found, did you mean:
Command 'eric' from package 'eric' (universe)
eris: command not found
```

Also, I've already tried Eris with golang 1.5 and it didn't work - only with 1.6. Does it support only 1.6? If so, there should be 1.6 https://github.com/Azure/azure-quickstart-templates/blob/master/eris-platform/setup.sh#L71. That's the error I get with 1.5:

```
azureuser@ether-camp-eris:~$ go get github.com/eris-ltd/eris-cli/cmd/eris
package github.com/eris-ltd/common/go/log: cannot find package "github.com/eris-ltd/common/go/log" in any of:
/usr/local/go/src/github.com/eris-ltd/common/go/log (from $GOROOT)
/home/azureuser/go/src/github.com/eris-ltd/common/go/log (from $GOPATH)
package github.com/fsouza/go-dockerclient/external/github.com/docker/docker/pkg/archive: cannot find package "github.com/fsouza/go-dockerclient/external/github.com/docker/docker/pkg/archive" in any of:
/usr/local/go/src/github.com/fsouza/go-dockerclient/external/github.com/docker/docker/pkg/archive (from $GOROOT)
/home/azureuser/go/src/github.com/fsouza/go-dockerclient/external/github.com/docker/docker/pkg/archive (from $GOPATH)
```

Start with eris-platform/setup.sh, especially the Go version reference at line 71, then deploy the template and inspect whether the Eris installation step completes. Done means a newly provisioned machine has the eris command available and the supported Go version is clear from the setup behavior.

Written by the indexing model from the issue text.