check for nvmrc and switch node version

if a .nvmrc file exists in a directory, read it to change node to the correct version
Also ignore this file globally from git repos

git/gitignore_global.symlink

@@ -18,3 +18,6 @@ Icon
 
 # typescript command garbage
 tscommand*.txt
+
+# nvm - the Node Version Manager
+.nvmrc

zsh/zshrc.symlink

@@ -21,7 +21,7 @@ fi
 
 
 # initialize autocomplete
-autoload -U compinit
+autoload -U compinit add-zsh-hook
 compinit
 
 for config ($ZSH/**/*completion.sh) source $config
@@ -63,6 +63,13 @@ fi
 # source nvm
 export NVM_DIR=~/.nvm
 
+load-nvmrc() {
+    if [[ -f .nvmrc && -r .nvmrc ]]; then
+        nvm use
+    fi
+}
+add-zsh-hook chpwd load-nvmrc
+
 if hash brew 2>/dev/null; then
     source $(brew --prefix nvm)/nvm.sh
     source `brew --prefix`/etc/profile.d/z.sh