remove rvm, part of prezto ruby module

zsh/rvm.zsh

@@ -1,17 +0,0 @@
-# RVM / rbenv
-if [[ -d ~/.rvm/ ]] && [[ -d ~/.rbenv/ ]]; then
-  # TODO: colorize
-  echo '***************************************************************'
-  echo 'ERROR!'
-  echo 'YADR found both ~/.rvm and ~/.rbenv directories. You cannot use'
-  echo 'RVM and rbenv simultaneously. Please delete one and reload zsh.'
-  echo '***************************************************************'
-  echo ''
-else
-  if [[ -d ~/.rvm/ ]]; then
-    [[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"
-  fi
-  if [[ -d ~/.rbenv/ ]]; then
-    eval "$(rbenv init -)"
-  fi
-fi