Search history using prefix with up/down

an intuitive ProTip from coderwall
Add ~/bin/contrib to PATH for downloaded scripts
Remember a few more packages to install
Add 'exif' diff tool (mostly as a reminder)

about binary diff tools
Fix bnm and pum aliases
Use less grep aliases in favor of GREP_OPTIONS
Commit old prefix alert for reference

I don't do it anymore, but i don't use it for anything else either.