Introduce *scan with "string" cursor parameter to support unsigned long

cursor

* overload all *scan method to change "int" cursor to "string" cursor
* set @Deprecated and leave reason to deprecate and when to remove to
current *scan method
* modify unit tests to make it work with new *scan method

src/main/java/redis/clients/jedis/ScanParams.java

@@ -12,6 +12,7 @@ import redis.clients.util.SafeEncoder;
 
 public class ScanParams {
     private List<byte[]> params = new ArrayList<byte[]>();
+    public final static String SCAN_POINTER_START = String.valueOf(0);
 
     public void match(final String pattern) {
 	params.add(MATCH.raw);