Problem::Evaluate implementation.

1. Add Problem::Evaluate and tests.
2. Remove Solver::Summary::initial/final_*
3. Remove Solver::Options::return_* members.
4. Various cpplint cleanups.

Change-Id: I4266de53489896f72d9c6798c5efde6748d68a47
diff --git a/internal/ceres/dense_qr_solver.cc b/internal/ceres/dense_qr_solver.cc
index 21b6b15..1fb9709 100644
--- a/internal/ceres/dense_qr_solver.cc
+++ b/internal/ceres/dense_qr_solver.cc
@@ -63,7 +63,8 @@
   }
 
   // rhs = [b;0] to account for the additional rows in the lhs.
-  const int augmented_num_rows = num_rows + ((per_solve_options.D != NULL) ? num_cols : 0);
+  const int augmented_num_rows =
+      num_rows + ((per_solve_options.D != NULL) ? num_cols : 0);
   if (rhs_.rows() != augmented_num_rows) {
     rhs_.resize(augmented_num_rows);
     rhs_.setZero();