Bookmarks for Bash

USAGE: wd <alias>                       cd to path pointed to by alias
   OR: wd h or --help                   display help information
   OR: wd l or --list                   list aliases and their paths
   OR: wd s or --set    <alias> <path>  set alias to point to path
   OR: wd c or --clear  <alias>         clear alias
   OR: wd t or --target <alias>         print path pointed to by alias
   OR: wd e or --edit                   open file for editing in vi

Also includes a version in Python and corresponding stub to interface with it