Cleaned up some requires here and there

modules/prelude-perl.el

@@ -32,6 +32,8 @@
 
 ;;; Code:
 
+(require 'prelude-programming)
+
 ;; use cperl-mode instead of perl-mode
 (defalias 'perl-mode 'cperl-mode)
 

modules/prelude-xml.el

@@ -32,6 +32,8 @@
 
 ;;; Code:
 
+(require 'nxml-mode)
+
 (push '("<\\?xml" . nxml-mode) magic-mode-alist)
 
 ;; pom files should be treated as xml files