AJAX constants added

datatables4j/issues#12
New Spring3 integration module
Fix for issue #17

datatables4j/issues#17 fixed
Wording issue fixed in XLS MIME type

datatables4j/issues#18 fixed
AJAX constants update

New fnServerData property
Code refactored and comments added
New AJAX beans

Linked with datatables4j/issues#12
New AJAX features

datatables4j/issues#12
AJAX and server-side processing related beans

datatables4j/issues#12
AJAX simplification

The WebResourceGenerator doesn't take into account whether the table's
source is DOM-based or AJAX-based
New table tag AJAX related attributes (serverSide, pipelining and
pipeSize)
datatables4j/issues#12
Spring MVC integration for server-side processing

datatbles4j/issues#12