Support pagination for counter columns

Code from Pagination part of Getting Started document:
```java
RowQuery<String, String> query = keyspace
    .prepareQuery(CF_STANDARD1)
    .getKey("TheRowKey")
    .autoPaginate(true));
	
while (!(columns = query.execute().getResult()).isEmpty()) {
    for (Column<String> c : columns) {
        System.out.println.info(c.getName());
    }
}
```
will loop infinitely if run on a column family containing counter columns.
This patch checks if column is a counter and sets corresponding predicate for next page.