Merge pull request #198 from pank/master

Disable export of PROMPT_COMMAND for bash shells.

Not using export means sub shells can't see the env
variable changes, but this shouldn't be an issue since
new sub shells should be sourcing ~/.bashrc anyway.

bin/autojump.bash

@@ -68,7 +68,7 @@ case $PROMPT_COMMAND in
     *autojump*)
         ;;
     *)
-        export PROMPT_COMMAND="${PROMPT_COMMAND:+$(echo "${PROMPT_COMMAND}" | awk '{gsub(/; *$/,"")}1') ; }autojump_add_to_database"
+        PROMPT_COMMAND="${PROMPT_COMMAND:+$(echo "${PROMPT_COMMAND}" | awk '{gsub(/; *$/,"")}1') ; }autojump_add_to_database"
         ;;
 esac