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/include/ceres/fpclassify.h b/include/ceres/fpclassify.h
index 5a9ea15..b730832 100644
--- a/include/ceres/fpclassify.h
+++ b/include/ceres/fpclassify.h
@@ -41,6 +41,8 @@
 #include <float.h>
 #endif
 
+#include <limits>
+
 namespace ceres {
 
 #if defined(_MSC_VER)