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

internal/ceres/problem_impl.h

diff --git a/internal/ceres/problem_impl.h b/internal/ceres/problem_impl.h
index 536e73a..ccc315d 100644
--- a/internal/ceres/problem_impl.h
+++ b/internal/ceres/problem_impl.h
@@ -53,6 +53,7 @@
 class CostFunction;
 class LossFunction;
 class LocalParameterization;
+struct CRSMatrix;
 
 namespace internal {
 
@@ -126,6 +127,13 @@
   void SetParameterBlockVariable(double* values);
   void SetParameterization(double* values,
                            LocalParameterization* local_parameterization);
+
+  bool Evaluate(const Problem::EvaluateOptions& options,
+                double* cost,
+                vector<double>* residuals,
+                vector<double>* gradient,
+                CRSMatrix* jacobian);
+
   int NumParameterBlocks() const;
   int NumParameters() const;
   int NumResidualBlocks() const;
@@ -139,6 +147,12 @@
  private:
   ParameterBlock* InternalAddParameterBlock(double* values, int size);
 
+  bool InternalEvaluate(Program* program,
+                        double* cost,
+                        vector<double>* residuals,
+                        vector<double>* gradient,
+                        CRSMatrix* jacobian);
+
   // Delete the arguments in question. These differ from the Remove* functions
   // in that they do not clean up references to the block to delete; they
   // merely delete them.