Update libtcmalloc LD_PRELOAD for Quantal (Ubuntu 12.10)

i.e. change from 'libtcmalloc-minimal0', which was removed from Ubuntu's
packages, to 'libtcmalloc-minimal4'.
Tweak zsh auto-corrections
Zsh tweaks (nohup & terminal control flow)
More extensive zsh completions cache
Add v=vim alias [zsh]
Tweak mouse settings [Microsoft Arc Mouse]
More vim's awesomeness brought into zsh

Source:
https://github.com/paradigm/dotfiles/blob/master/.zshrc
Reorganize $PATH additions [zsh]
Add 'fame' function (code ownership using git blame) [zsh]