Update _brew to match latest

Updated _brew to match latest in https://github.com/Homebrew/homebrew/blob/master/Library/Contributions/brew_zsh_completion.zsh

plugins/brew/_brew

 #compdef brew
 #autoload
 
-# imported from the latest homebrew contributions
+# imported from https://github.com/Homebrew/homebrew/blob/master/Library/Contributions/brew_zsh_completion.zsh
+
+# Brew ZSH completion function
+# Drop this somewhere in your $fpath (like /usr/share/zsh/site-functions)
+# and rename it _brew
+#
+# altered from _fink
 
 _brew_all_formulae() {
   formulae=(`brew search`)
@@ -15,6 +21,14 @@ _brew_installed_taps() {
   installed_taps=(`brew tap`)
 }
 
+_brew_official_taps() {
+  official_taps=(`brew tap --list-official`)
+}
+
+_brew_pinned_taps() {
+  pinned_taps=(`brew tap --list-pinned`)
+}
+
 _brew_outdated_formulae() {
   outdated_formulae=(`brew outdated`)
 }
@@ -25,8 +39,10 @@ _1st_arguments=(
   'cat:display formula file for a formula'
   'cleanup:uninstall unused and old versions of packages'
   'commands:show a list of commands'
+  'config:show homebrew and system configuration'
   'create:create a new formula'
-  'deps:list dependencies of a formula'
+  'deps:list dependencies and dependants of a formula'
+  'desc:display a description of a formula'
   'doctor:audits your installation for common issues'
   'edit:edit a formula'
   'fetch:download formula resources to the cache'
@@ -37,40 +53,45 @@ _1st_arguments=(
   'reinstall:install a formula anew; re-using its current options'
   'leaves:show installed formulae that are not dependencies of another installed formula'
   'link:link a formula'
+  'linkapps:symlink .app bundles provided by formulae into /Applications'
   'list:list files in a formula or not-installed formulae'
   'log:git commit log for a formula'
   'missing:check all installed formuale for missing dependencies.'
+  'migrate:migrate renamed formula to new name'
   'outdated:list formulae for which a newer version is available'
   'pin:pin specified formulae'
   'postinstall:perform post_install for a given formula'
   'prune:remove dead links'
   'remove:remove a formula'
   'search:search for a formula (/regex/ or string)'
-  'switch:switch linkage between installed versions of a formula'
+  'switch:switch between different versions of a formula'
   'tap:tap a new formula repository from GitHub, or list existing taps'
+  'tap-info:information about a tap'
+  'tap-pin:pin a tap'
+  'tap-unpin:unpin a tap'
   'test-bot:test a formula and build a bottle'
   'uninstall:uninstall a formula'
   'unlink:unlink a formula'
+  'unlinkapps:remove symlinked .app bundles provided by formulae from /Applications'
   'unpin:unpin specified formulae'
   'untap:remove a tapped repository'
-  'update:pull latest repository'
+  'update:fetch latest version of Homebrew and all formulae'
   'upgrade:upgrade outdated formulae'
   'uses:show formulae which depend on a formula'
+  `brew commands --quiet --include-aliases`
 )
 
 local expl
-local -a formulae installed_formulae installed_taps outdated_formulae
+local -a formulae installed_formulae installed_taps official_taps outdated_formulae
 
 _arguments \
   '(-v)-v[verbose]' \
   '(--cellar)--cellar[brew cellar]' \
-  '(--config)--config[brew configuration]' \
   '(--env)--env[brew environment]' \
   '(--repository)--repository[brew repository]' \
   '(--version)--version[version information]' \
   '(--prefix)--prefix[where brew lives on this system]' \
   '(--cache)--cache[brew cache]' \
-  '(--force)--force[brew force]' \
   '*:: :->subcmds' && return 0
 
 if (( CURRENT == 1 )); then
@@ -79,9 +100,18 @@ if (( CURRENT == 1 )); then
 fi
 
 case "$words[1]" in
-  install|reinstall|audit|home|homepage|log|info|abv|uses|cat|deps|edit|options)
+  install|reinstall|audit|home|homepage|log|info|abv|uses|cat|deps|desc|edit|options|switch)
     _brew_all_formulae
     _wanted formulae expl 'all formulae' compadd -a formulae ;;
+  linkapps|unlinkapps)
+    _arguments \
+      '(--local)--local[operate on ~/Applications instead of /Applications]' \
+      '1: :->forms' && return 0
+
+    if [[ "$state" == forms ]]; then
+      _brew_installed_formulae
+      _wanted installed_formulae expl 'installed formulae' compadd -a installed_formulae
+    fi ;;
   list|ls)
     _arguments \
       '(--unbrewed)--unbrewed[files in brew --prefix not controlled by brew]' \
@@ -100,9 +130,15 @@ case "$words[1]" in
     _arguments \
       '(--macports)--macports[search the macports repository]' \
       '(--fink)--fink[search the fink repository]' ;;
-  untap)
+  untap|tap-info|tap-pin)
     _brew_installed_taps
-    _wanted installed_taps expl 'installed taps' compadd -a installed_taps ;;
+    _wanted installed_taps expl 'installed taps' compadd -a installed_taps ;;
+  tap)
+    _brew_official_taps
+    _wanted official_taps expl 'official taps' compadd -a official_taps ;;
+  tap-unpin)
+    _brew_pinned_taps
+    _wanted pinned_taps expl 'pinned taps' compadd -a pinned_taps ;;
   upgrade)
     _brew_outdated_formulae
     _wanted outdated_formulae expl 'outdated formulae' compadd -a outdated_formulae ;;