Updates go version to 1.5.1, and modernizes the Vagrantfile.

Drops 32bit in the Vagrantfile as well since we can build that with
gox and don't need a special environment for it. The Vagrantfile is
now just a good default development environment.

README.md

@@ -43,7 +43,7 @@ http://www.consul.io/docs
 ## Developing Consul
 
 If you wish to work on Consul itself, you'll first need [Go](https://golang.org)
-installed (version 1.4+ is _required_). Make sure you have Go properly installed,
+installed (version 1.5.1+ is _required_). Make sure you have Go properly installed,
 including setting up your [GOPATH](https://golang.org/doc/code.html#GOPATH).
 
 Next, clone this repository into `$GOPATH/src/github.com/hashicorp/consul` and
@@ -66,7 +66,7 @@ format the code according to Go standards.
 
 ### Building Consul on Windows
 
-Make sure Go 1.4+ is installed on your system and that the Go command is in your
+Make sure Go 1.5.1+ is installed on your system and that the Go command is in your
 %PATH%.
 
 For building Consul on Windows, you also need to have MinGW installed.

Vagrantfile

@@ -5,6 +5,7 @@
 VAGRANTFILE_API_VERSION = '2'
 
 @script = <<SCRIPT
+GOVERSION="1.5.1"
 SRCROOT="/opt/go"
 SRCPATH="/opt/gopath"
 
@@ -17,8 +18,8 @@ sudo apt-get install -y build-essential git-core
 
 # Install Go
 cd /tmp
-wget --quiet --no-check-certificate https://storage.googleapis.com/golang/go1.4.2.linux-${ARCH}.tar.gz
-tar -xvf go1.4.2.linux-${ARCH}.tar.gz
+wget --quiet --no-check-certificate https://storage.googleapis.com/golang/go${GOVERSION}.linux-${ARCH}.tar.gz
+tar -xvf go${GOVERSION}.linux-${ARCH}.tar.gz
 sudo mv go $SRCROOT
 sudo chmod 775 $SRCROOT
 sudo chown vagrant:vagrant $SRCROOT
@@ -56,14 +57,8 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
     end
   end
 
-  # Note we use older boxes here to avoid glibc version check problems with
-  # the built C dependencies.
   config.vm.define '64bit' do |n1|
-    n1.vm.box = 'chef/ubuntu-10.04'
-  end
-
-  config.vm.define '32bit' do |n2|
-    n2.vm.box = 'chef/ubuntu-10.04-i386'
+    n1.vm.box = 'hashicorp/precise64'
   end
 
   config.push.define "www", strategy: "local-exec" do |push|