Better installation of fasd [Close #123]

Now with zsh tab completion for `z` and other fasd commands!

zsh/fasd.zsh

@@ -1,16 +1,17 @@
+#
 # only init if installed.
-if [[ -f $HOME/.fasd ]]; then
-  # Initialize fasd (https://github.com/clvv/fasd)
-  eval "$(fasd --init posix-alias zsh-hook)"
+fasd_cache="$HOME/.fasd-init-bash"
+if [ "$(command -v fasd)" -nt "$fasd_cache" -o ! -s "$fasd_cache" ]; then
+  eval "$(fasd --init posix-alias zsh-hook zsh-ccomp zsh-ccomp-install zsh-wcomp zsh-wcomp-install)" >| "$fasd_cache"
+fi
+source "$fasd_cache"
+unset fasd_cache
 
-  # aliases
 
 # jump to recently used items
 alias a='fasd -a' # any
-  alias s='fasd -s' # show / search / select
+alias s='fasd -si' # show / search / select
 alias d='fasd -d' # directory
 alias f='fasd -f' # file
 alias z='fasd_cd -d' # cd, same functionality as j in autojump
-  alias v='f -e vim' # quick opening files with vim
-fi
-
+alias zz='fasd_cd -d -i' # interactive directory jump