fixed compilation issues under linux centOS.

src/CountMinSketch.hpp

@@ -11,6 +11,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <limits.h>
 #include "rock_commons.h"
 
 

src/ROCKparams.cpp

@@ -4,6 +4,7 @@
  *  Created on: Jul 25, 2016
  *      Author: vlegrand
  */
+#include <limits.h>
 #include <iostream>
 #include <fstream>
 #include <string>

src/main_utils.cpp

@@ -6,9 +6,11 @@
  */
 #include <stdint.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/sysctl.h>
 #include <sys/stat.h>
+#include <limits.h>
 #include <string.h>
 #include <iostream>
 #include <fstream>

src/unit_tests_tools.cpp

@@ -4,6 +4,7 @@
  *  Created on: Jan 4, 2017
  *      Author: vlegrand
  */
+#include <string.h>
 #include <iostream>
 #include <fstream>
 #include <assert.h>