Encoder support for random bytes

Good morning, I've added supported for encoders because not everyone speaks binary :)

Also, the Random class was renamed to avoid confusion with other APIs. *SecureRandom* was changed to static, because Java is a beast to collect entropy. Is not something to affect mobile devices, but speaking about servers like UPS, this might slow down the server.

If you want to test it, just run the following code:
```
public class Test {
 
    public static void main(String[] args) throws NoSuchAlgorithmException {
        int i = 0;
        long startTime = System.currentTimeMillis();
        while (i < 100000) {
            RandomUtils.randomBytes();
            i++;
        }
        long endTime = System.currentTimeMillis();
        System.out.println("#1 Total execution time: " + (endTime-startTime) + "ms");
 
        System.out.println("=====");
 
        int x = 0;
        long startTimeX = System.currentTimeMillis();
        while (x < 100000) {
            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
            byte[] buffer = new byte[16];
            secureRandom.nextBytes(buffer);
            x++;
        }
        long endTimeX = System.currentTimeMillis();
        System.out.println("#2 Total execution time: " + (endTimeX-startTimeX) + "ms");
    }
}
```