Added Timestamp conversion to std::chrono::microseconds. BaseSniffer is now movable.

include/timestamp.h

@@ -31,6 +31,10 @@
 #define TINS_TIMESTAMP_H
 
 #include <sys/time.h>
+#include "cxxstd.h"
+#if TINS_IS_CXX11
+    #include <chrono>
+#endif
 
 namespace Tins {
 /**
@@ -62,6 +66,15 @@ public:
     suseconds_t microseconds() const {
         return tv.tv_usec;
     }
+    
+    #if TINS_IS_CXX11
+        /**
+         * Converts this Timestamp to a std::chrono::microseconds
+         */
+        operator std::chrono::microseconds() const {
+            return std::chrono::microseconds(seconds() * 1000000 + microseconds());
+        }
+    #endif
 private:
     timeval tv;
 };