Update copyright headers with new year and URL

Since Ceres is moving to using GitHub for issues, and the Google
Code URL in the current copyright header will soon become invalid,
update all the headers.

Change-Id: I1fce70375d1bcf098591f07b4d8f01a5c1e0789c
diff --git a/internal/ceres/linear_operator.cc b/internal/ceres/linear_operator.cc
index 4b59fa1..9d291bd 100644
--- a/internal/ceres/linear_operator.cc
+++ b/internal/ceres/linear_operator.cc
@@ -1,6 +1,6 @@
 // Ceres Solver - A fast non-linear least squares minimizer
-// Copyright 2010, 2011, 2012 Google Inc. All rights reserved.
-// http://code.google.com/p/ceres-solver/
+// Copyright 2015 Google Inc. All rights reserved.
+// http://ceres-solver.org/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are met: