Updated all plugins that are non-forked. Added some new plugins.

Added update_plugins.py which can fetch new plugins from GitHub.

New plugins added: zencoding, vim-indent-object, taglist, nginx.vim

sources_non_forked/snipmate-snippets/ruby-rails/sweeper.snippet

@@ -0,0 +1,15 @@
+class ${1:ModelClassName}Sweeper < ActionController::Caching::Sweeper
+	observe $1
+
+	def after_save(${2:model_class_name})
+		expire_cache($2)
+	end
+
+	def after_destroy($2)
+		expire_cache($2)
+	end
+
+	def expire_cache($2)
+		expire_page
+	end
+end