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* Added support for plugins.
* This introduces plugin hooks ``pypom_after_wait_for_page_to_load`` and
``pypom_after_wait_for_region_to_load``.
* In order to take advantage of plugin support you must avoid implementing
``wait_for_page_to_load`` or ``wait_for_region_to_load`` in your page
objects.
* This was previously the only way to implement a custom wait for your pages
and regions, but now means the calls to plugin hooks would be bypassed.
* Custom waits can now be achieved by implementing a ``loaded`` property on
the page or region, which returns ``True`` when the page or region has
finished loading.
* See the user guide for more details.
* Any unused ``url_kwargs`` after formatting ``URL_TEMPLATE`` are added as URL
query string parameters.