SFML::Window now supports taking in Vector2 on methods where it would be relevant.

(Example: SFML::Window#cursor_position = [255, 255] )

Updated the demo file to show this in action.

git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1655 4e206d99-4929-0410-ac5d-dfc041789085

bindings/ruby/testing/window-demo.rb

@@ -1,8 +1,9 @@
 require 'sfml/system'
 require 'sfml/window'
 
-app = SFML::Window.new( SFML::VideoMode.new( 800, 600 ), "My Ruby SFML" )
+app = SFML::Window.new( [800, 600], "My Ruby SFML" )
 app.framerate = 100
+app.position = [300, 300]
 input = app.input
 
 while app.open?