Add "desc" calls, and move a mkdir around, to have it for both Win32 and Unix

desc_for_se_ide_raketasks.diff

Index: rake-tasks/se-ide.rb
===================================================================
--- rake-tasks/se-ide.rb	(revision 8429)
+++ rake-tasks/se-ide.rb	(working copy)
@@ -4,7 +4,9 @@
   base_ide_dir = File.expand_path(File.dirname(Dir.glob("Rakefile")[0]))
   files = []
 
+	desc "Prepare the development environment for the Selenium IDE Firefox plugin"
   task :setup_proxy do
+    mkdir "ide/src/extension/content-files"
     if unix?
       # the files in core -- except for the scripts directory which already exists in the target
       ln_s Dir.glob(base_ide_dir + "/common/src/js/core/*").select { |fn| fn != base_ide_dir + "/common/src/js/core/scripts" },
@@ -29,7 +31,6 @@
       end
       
       # and lastly the scriptrunner
-      mkdir "ide/src/extension/content-files"
       f = Dir.glob(base_ide_dir + "/common/src/js/core/scripts/selenium-testrunner.js")
       f.each do |c|
         files << base_ide_dir + "ide/src/extension/content-files/selenium-testrunner.js"
@@ -61,6 +62,7 @@
     end
   end
   
+	desc "Tear down the development environment for the Selenium IDE Firefox plugin"
   task :remove_proxy do
     if unix?
       Dir.glob("ide/**/*").select { |fn| rm fn if File.symlink?(fn) }
@@ -74,9 +76,9 @@
         end
       end
       listoffiles.close()
-	rm base_ide_dir + "/proxy_files.txt"
+      rm base_ide_dir + "/proxy_files.txt"
     end
-    
-    rm "ide/src/extension/components/SeleniumIDEGenericAutoCompleteSearch.xpt"
+    rm "ide/src/extension/components/SeleniumIDEGenericAutoCompleteSearch.xpt" if File.exists?("ide/src/extension/components/SeleniumIDEGenericAutoCompleteSearch.xpt")
+    rm_rf "ide/src/extension/content-files" if File.exists?("ide/src/extension/content-files")
   end
 end
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