Must honor group by, having, limit and offset for exists.

Author: mpfeiffermway

src/com/activeandroid/query/From.java

@@ -267,6 +267,10 @@ public String toExistsSql() {
         addFrom(sql);
         addJoins(sql);
         addWhere(sql);
+        addGroupBy(sql);
+        addHaving(sql);
+        addLimit(sql);
+        addOffset(sql);
 
         sql.append(")");