Fix the asterisk bug and a trivial bug.
Add PjaxSettings extending from JQueryAjaxSettings.
Format the test file.
Refine the definition of $.fn.pjax method.
Add definition and test for $.pjax.click function.
Add definition and test for $.pjax.submit function.

It is nearly same with $.pjax.click function.
Add definition and test for $.pjax function.
Add definition for $.pjax.enable and $.pjax.disable.
Add definition and test for $.pjax.reload method.
Add definition and test for $.pjax.defaults property.
Add definition and test for $.support.pjax property.