refactored random subsystem

added compile-time seed support

math/distribution/Exponential.h

@@ -3,7 +3,7 @@
 
 #include <cmath>
 #include <random>
-
+#include "../Random.h"
 
 namespace Distribution {
 
@@ -14,13 +14,13 @@ namespace Distribution {
 
 		const T lambda;
 
-		std::minstd_rand gen;
+		RandomGenerator gen;
 		std::exponential_distribution<T> dist;
 
 	public:
 
 		/** ctor */
-		Exponential(const T lambda) : lambda(lambda), dist(lambda) {
+		Exponential(const T lambda) : lambda(lambda), gen(RANDOM_SEED), dist(lambda) {
 			;
 		}