Tell the user when build logs are copied

Library/Homebrew/formula.rb

@@ -192,14 +192,9 @@ class Formula
         yield self
       rescue Interrupt, RuntimeError, SystemCallError => e
         unless ARGV.debug?
-          logs = File.expand_path '~/Library/Logs/Homebrew/'
-          if File.exist? 'config.log'
-            mkdir_p logs
-            mv 'config.log', logs
-          end
-          if File.exist? 'CMakeCache.txt'
-            mkdir_p logs
-            mv 'CMakeCache.txt', logs
+          %w(config.log CMakeCache.txt).select{|f| File.exist? f}.each do |f|
+            HOMEBREW_LOGS.install f
+            ohai "#{f} was copied to #{HOMEBREW_LOGS}"
           end
           raise
         end

Library/Homebrew/global.rb

@@ -51,6 +51,9 @@ else
   HOMEBREW_REPOSITORY+"Cellar"
 end
 
+HOMEBREW_LOGS = Pathname.new('~/Library/Logs/Homebrew/').expand_path
+
+
 MACOS_FULL_VERSION = `/usr/bin/sw_vers -productVersion`.chomp
 MACOS_VERSION = /(10\.\d+)(\.\d+)?/.match(MACOS_FULL_VERSION).captures.first.to_f