More .DS_Store ignoring

* Don't link .DS_Store files
* Don't list .DS_Store files in `brew info`

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Library/Homebrew/brew.h.rb

@@ -198,6 +198,7 @@ def info f
   if f.prefix.parent.directory?
     kids=f.prefix.parent.children
     kids.each do |keg|
+      next if keg.basename.to_s == '.DS_Store'
       print "#{keg} (#{keg.abv})"
       print " *" if f.installed_prefix == keg and kids.length > 1
       puts

Library/Homebrew/extend/pathname.rb

@@ -92,7 +92,7 @@ class Pathname
 
   def abv
     out=''
-    n=`find #{to_s} -type f | wc -l`.to_i
+    n=`find #{to_s} -type f ! -name .DS_Store | wc -l`.to_i
     out<<"#{n} files, " if n > 1
     out<<`/usr/bin/du -hd0 #{to_s} | cut -d"\t" -f1`.strip
   end

Library/Homebrew/keg.rb

@@ -98,7 +98,7 @@ protected
       dst.extend ObserverPathnameExtension
 
       if src.file?
-        dst.make_relative_symlink src
+        dst.make_relative_symlink src unless File.basename(src) == '.DS_Store'
       elsif src.directory?
         # if the dst dir already exists, then great! walk the rest of the tree tho
         next if dst.directory? and not dst.symlink?