Implemented broadcastAndStore and sendTrytes

src/main/java/jota/utils/SeedRandomGenerator.java

@@ -1,6 +1,6 @@
 package jota.utils;
 
-import java.util.Random;
+import java.security.SecureRandom;
 
 /**
  * Created by pinpong on 13.12.16.
@@ -10,7 +10,7 @@ public class SeedRandomGenerator {
     public static String generateNewSeed() {
         char[] chars = Constants.TRYTE_ALPHABET.toCharArray();
         StringBuilder builder = new StringBuilder();
-        Random random = new Random();
+        SecureRandom random = new SecureRandom();
         for (int i = 0; i < Constants.SEED_LENGTH_MAX; i++) {
             char c = chars[random.nextInt(chars.length)];
             builder.append(c);