Add rcm post-up hook copied from thoughtbot

hooks/post-up

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+# Install or Upgrade vim-plug minimalist plugin manager
+# https://github.com/junegunn/vim-plug
+if [ -e "$HOME/.vim/autoload/plug.vim" ]; then
+  vim -E -s +PlugUpgrade +qa
+else
+  curl -fLo "$HOME/.vim/autoload/plug.vim" --create-dirs \
+    https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
+fi
+
+# Install or update plugins
+vim -u "$HOME/.vim/bundles.vim" +PlugUpdate +PlugClean! +qa
+
+reset -Q
+
+# detect old OS X broken /etc/zshenv and suggest rename
+if grep -qw path_helper /etc/zshenv 2>/dev/null; then
+  dir=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd -P)
+  cat <<MSG >&2
+Warning: \`/etc/zshenv' configuration file on your system may cause unexpected
+PATH changes on subsequent invocations of the zsh shell. The solution is to
+rename the file to \`zprofile':
+  sudo mv /etc/{zshenv,zprofile}
+(called from ${dir}/post-up:${LINENO})
+MSG
+fi