added auto-fu completions, ctrl+arrow-up/down substring-history-search and improved installer
working on installer
Squashed 'bundle/zsh-auto-fu/' content from commit 753667c

git-subtree-dir: bundle/zsh-auto-fu
git-subtree-split: 753667ca0aee8d235d86d4c1b46300fb95502bea
Merge commit 'd5c67a63e8cb4ce43cc7911a09b5c01572fffc03' as 'bundle/zsh-auto-fu'
- finally fixed the installer