Set AUTOJUMP env variables using `set -gx`.

Due to changes in the way fish handles variable lookup the fish
autojump integration stopped working with fish version 2.3.

By exporting the needed variables globally it works also with fish 2.3.

bin/autojump.fish

@@ -1,4 +1,4 @@
-set -x AUTOJUMP_SOURCED 1
+set -gx AUTOJUMP_SOURCED 1
 
 # set user installation path
 if test -d ~/.autojump
@@ -17,11 +17,11 @@ complete -x -c j -a '(autojump --complete (commandline -t))'
 
 # set error file location
 if test (uname) = "Darwin"
-    set -x AUTOJUMP_ERROR_PATH ~/Library/autojump/errors.log
+    set -gx AUTOJUMP_ERROR_PATH ~/Library/autojump/errors.log
 else if test -d "$XDG_DATA_HOME"
-    set -x AUTOJUMP_ERROR_PATH $XDG_DATA_HOME/autojump/errors.log
+    set -gx AUTOJUMP_ERROR_PATH $XDG_DATA_HOME/autojump/errors.log
 else
-    set -x AUTOJUMP_ERROR_PATH ~/.local/share/autojump/errors.log
+    set -gx AUTOJUMP_ERROR_PATH ~/.local/share/autojump/errors.log
 end
 
 if test ! -d (dirname $AUTOJUMP_ERROR_PATH)