add chpwd helper for nvm

zshrc

@@ -39,16 +39,22 @@ alias stayawake="caffeinate -s -d -i"
 export PATH="/usr/local/heroku/bin:$PATH"
 
 # Setup RVM
-export PATH="$PATH:$HOME/.rvm/bin" # Add RVM to PATH for scripting
+export PATH="$HOME/.rvm/bin:$PATH" # Add RVM to PATH for scripting
 export rvm_project_rvmrc=1
 test -e ${HOME}/.rvm/scripts/rvm && source ${HOME}/.rvm/scripts/rvm
 
 # Check if dinghy is installed, and run shellinit if it exists
-which dinghy 2>1 >/dev/null && eval $(dinghy shellinit)
+which dinghy 2>&1 >/dev/null && eval $(dinghy shellinit)
 
 # Setup NVM
 export NVM_DIR=~/.nvm
 test -e $(brew --prefix nvm)/nvm.sh && source $(brew --prefix nvm)/nvm.sh
+function chpwd() {
+    # If there is an `.nvmrc` file then run `nvm use`
+    if [ -r $PWD/.nvmrc ]; then
+        nvm use
+    fi
+}
 
 # Setup iterm2 shell integration
 test -e ${HOME}/.iterm2_shell_integration.zsh && source ${HOME}/.iterm2_shell_integration.zsh