Add vagrant elixir setup scripts.

scripts/elixir.sh

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+# Installs Elixir from github cloned source.
+# Requires erlang.sh
+# add to Vagrantfile:
+#  config.vm.provision 'shell', path: 'erlang.sh'
+#  config.vm.provision 'shell', privileged: false, path: 'elixir.sh'
+
+if [ -d /home/vagrant/elixir ] ; then
+  echo 'Elixir already installed'
+else
+  sudo apt-get install make -y
+  cd ~
+  git clone https://github.com/elixir-lang/elixir.git
+  cd elixir
+  git checkout v0.15.0
+  make clean
+  make
+fi
+
+if grep -lq 'elixir/bin' /home/vagrant/.bashrc ; then
+  echo 'Elixir already added to path'
+else
+  echo 'export PATH=/home/vagrant/elixir/bin:$PATH' >> /home/vagrant/.bashrc
+fi

scripts/erlang.sh

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+# Installs Erlang via erlang-solutions repo
+# add to Vagrantfile:
+#  config.vm.provision 'shell', path: 'erlang.sh'
+
+if grep -lq 'erlang-solutions' /etc/apt/sources.list ; then
+  echo 'Erlang source already added'
+else
+  cd /tmp
+  wget http://packages.erlang-solutions.com/erlang-solutions_1.0_all.deb
+  dpkg -i erlang-solutions_1.0_all.deb
+  apt-get update -y
+  apt-get install erlang -y
+fi