Bugfix - Paging options fixes

This makes some fixes based on some regressions introduced in **1.0.8**

The `buildPagingOptions()` method can now be called statically from an external (not extending) class without resorting to the use of **table** or DB Model specific methods being called.

This also allows late-static binding on the default paging/ordering constants, so each model can set their own preferences there.