Bullet: Update to 2.79

-Updated the url to download the latest tgz.
-Added version number since brew might get confused by the tgz's name.
-Changed from md5 to sha1, since sha1 checksums are provided by bullet:
http://code.google.com/p/bullet/downloads/detail?name=bullet-2.79-rev2440.tgz

Closes Homebrew/homebrew#8093.

Signed-off-by: Charlie Sharpsteen <source@sharpsteen.net>

Formula/bullet.rb

@@ -1,9 +1,10 @@
 require 'formula'
 
 class Bullet < Formula
-  url 'http://bullet.googlecode.com/files/bullet-2.77.tgz'
+  url 'http://bullet.googlecode.com/files/bullet-2.79-rev2440.tgz'
   homepage 'http://bulletphysics.org/wordpress/'
-  md5 '2f5074a1a29b618c672f1da4748e374b'
+  sha1 '49b4b362a0c8d279e32b946ef9578b1dd8c5987c'
+  version '2.79'
 
   depends_on 'cmake' => :build
 
@@ -12,7 +13,7 @@ class Bullet < Formula
       ['--framework'  , "Build Frameworks"],
       ['--universal'  , "Build in universal mode"],
       ['--shared'     , "Build shared libraries"],
-      ['--build-demo' , "Build demo application"],
+      ['--build-demo' , "Build demo applications"],
       ['--build-extra', "Build extra library"]
     ]
   end