Instructions for building on various platforms

Include Vagrant files for FreeBSD 10.2 and Ubuntu Linux 14.04 LTS.

vagrant/freebsd10/Vagrantfile

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+#
+# Vagrantfile for FreeBSD 10.2 test environment.
+#
+Vagrant.configure(2) do |config|
+
+  config.vm.box = "freebsd/FreeBSD-10.2-RELEASE"
+
+  # this box needs a MAC address
+  config.vm.base_mac = '0800273E2877'
+
+  # need enough memory to build syntex_syntax crate
+  config.vm.provider 'virtualbox' do |vb|
+    vb.memory = 2048
+  end
+
+  # bring the system up to date
+  config.vm.provision "shell", inline: <<-SHELL
+    sudo freebsd-update fetch install
+    sudo pkg update
+    sudo pkg upgrade -y
+    sudo pkg autoremove -y
+    sudo pkg clean -y
+  SHELL
+
+end

vagrant/ubuntu14/Vagrantfile

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+#
+# Vagrantfile for Ubuntu 14.04 test environment.
+#
+Vagrant.configure(2) do |config|
+
+  config.vm.box = "ubuntu/trusty64"
+
+  # need enough memory to build syntex_syntax crate
+  config.vm.provider 'virtualbox' do |vb|
+    vb.memory = 2048
+  end
+
+  # bring the system up to date
+  config.vm.provision "shell", inline: <<-SHELL
+    sudo apt-get autoremove
+    sudo apt-get update
+    sudo apt-get upgrade
+  SHELL
+
+end