use zprofile instead of zshenv

/etc/profile will overwrite PATH when using zshenv, see
https://bugs.archlinux.org/task/35966

zshrc

@@ -23,31 +23,6 @@ if ! zgen saved; then
     zgen save
 fi
 
-# extend path
-export PATH="$HOME/local/bin:$PATH"
-
-# nvm
-export NVM_DIR="$HOME/.nvm"
-[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"
-# use node version specified in ~/.nvmrc as default
-nvm use > /dev/null
-
-# Base16 Shell
-BASE16_SCHEME="solarized"
-BASE16_SHELL="$HOME/.base16-shell/base16-$BASE16_SCHEME.dark.sh"
-[[ -s $BASE16_SHELL ]] && . $BASE16_SHELL
-
-########################
-# Dist related settings
-########################
-case $OSTYPE in
-    "darwin14.0" )
-        export PATH="$(brew --prefix coreutils)/libexec/gnubin:/usr/local/bin:$PATH"
-        export MANPATH="$(brew --prefix coreutils)/libexec/gnuman:$MANPATH"
-        #eval $(ssh-agent -s)
-        ;;
-esac
-
 ########################
 # Other settings 
 ########################