Refactor: Ajax callback breakout

Current situation (as of late May 2011, pre-Beta 1)

• The jQuery Mobile $.ajax() call lives in jquery.mobile.navigation.js within a function named $.mobile.loadPage.

• The success and error callbacks are defined inline within the $.ajax() call itself.

• The notion is breaking-out these callbacks would greatly improve jQuery Mobile extensibility by making the callbacks accessible.

Current blockers in the success callback

• Reference to memvar fileUrl which is defined in the $.mobile.loadPage closure. fileurl is moreover dependent on memvar absUrl which depends on $.mobile.loadPage parameter `url.

• Reference to memvar base which is defined in the $.mobile.loadPage closure.

• more coming...