SCryptUtil should accept char[] in addition to String

[bannmann]

The password parameters of SCryptUtil.scrypt() and check() are strings, which should not be used for passwords as explained here. For developers that care about these nuances, it would be great if you provided additional overloads that allow using a char[]:

public static String scrypt(char[] passwd, int N, int r, int p)
public static boolean check(char[] passwd, String hashed)

Note that I consider the hash to be harmless and kept it inside a String; one might argue to use char[] here for consistency.