Datepicker: Clean up tests
[]: Squash this with other clean up commits (SEE NOTE)

NOTE: Make sure this doesn't cause problems with the customStructure commit

Datepicker: Saner id attribute values for the test suite.
Datepicker: Support changing the appendTo option after init

Adding tests for the appendTo option.
Datepicker: Various changes for the showWeek option.

* Re-add ui-datepicker-week-col class name currently used.
* Add test suite.
* Support changing option after initialization.
Datepicker: Support position option changes after init

Added position option tests.
Datepicker: Support changing eachDay after initialization

Add tests for eachDay.
Datepicker: Allow dateFormat to be changed after init

Add dateFormat tests.
Datepicker: Add test to ensure the <input>'s value is preselected
Datepicker: Implementing a value() method.
Datepicker: Implement a valueAsDate() method.
Datepicker: Support destroying inline datepickers.
Datepicker: Add tests for the value() and valueAsDate() methods and inline pickers.
Datepicker: Remove unnecessary code now that destroying inline pickers is supported.
Datepicker: Enter keypresses on the <input> should select the current date
Datepicker: Enable enter with existing value test. Coding standards cleanup of keyboard tests.
Datepicker: Restore handling of Control+Home and Control+End on the <input>.
Datepicker: Updating escape key tests to new APIs.
Datepicker: First batch of tests for arrow key handling.
Datepicker: Use Globalize 1.0.0
Datepicker: Test for up and down arrow keys