Do not export GEM_HOME in launchd.

Exporting GEM_HOME in launchd conflicts with RVM and rbenv.
There are currently no known GUI programs that need it.

plugins/ruby/init.zsh

@@ -21,9 +21,6 @@ else
   if [[ "$OSTYPE" == darwin* ]]; then
     export GEM_HOME="$HOME/Library/Ruby/Gems/1.8"
     path=("$GEM_HOME/bin" $path)
-
-    # Set environment variables for launchd processes.
-    launchctl setenv GEM_HOME "$GEM_HOME" &!
   fi
 fi