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
Merge branch 'unsigned_long_cursor_with_compatibility' of github.com:HeartSaVioR/jedis into HeartSaVioR-unsigned_long_cursor_with_compatibility
Merge branch 'master' into HeartSaVioR-unsigned_long_cursor_with_compatibility