Deprecate use_in_file_templates!

Use enable :inline_templates instead

README.rdoc

@@ -219,7 +219,7 @@ Or, specify an explicit Hash of local variables:
 This is typically used when rendering templates as partials from within
 other templates.
 
-=== In-file Templates
+=== Inline Templates
 
 Templates may be defined at the end of the source file:
 
@@ -239,9 +239,9 @@ Templates may be defined at the end of the source file:
   @@ index
   %div.title Hello world!!!!!
 
-NOTE: In-file templates defined in the source file that requires sinatra
-are automatically loaded. Call the <tt>use_in_file_templates!</tt>
-method explicitly if you have in-file templates in other source files.
+NOTE: Inline templates defined in the source file that requires sinatra
+are automatically loaded. Call `enable :inline_templates` explicitly if you
+have inline templates in other source files.
 
 === Named Templates
 

lib/sinatra.rb

@@ -4,4 +4,4 @@ $LOAD_PATH.unshift(libdir) unless $LOAD_PATH.include?(libdir)
 require 'sinatra/base'
 require 'sinatra/main'
 
-use_in_file_templates!
+enable :inline_templates

lib/sinatra/base.rb

@@ -720,10 +720,16 @@ module Sinatra
         template name, &block
       end
 
+      def use_in_file_templates!(file=nil)
+        warn "use_in_file_templates! is deprecated; " \
+          "use enable :inline_templates instead"
+        set :inline_templates, file
+      end
+
       # Load embeded templates from the file; uses the caller's __FILE__
       # when no file is specified.
-      def use_in_file_templates!(file=nil)
-        file ||= caller_files.first
+      def inline_templates=(file=nil)
+        file = (file.nil? || file == true) ? caller_files.first : file
 
         begin
           app, data =