Add empty jquery.pjax definition and test file.
Add definition and test for jquery.fn.pjax method.
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.
Update definition file header.
Write my name on CONTRIBUTORS.md :)
Merge pull request #2366 from lijunle/jquery-pjax

Definition for jquery.pjax plugin.