Make fewer calls to $.inArray when assigning sort classes
Make fewer calls to $.inArray when assigning sort classes

Only call once each to check to see sort ascending / sort descending is is active.  (And only check for the descending class if we didn't find the ascending class)

Should also lead to smaller minified code.
idleog/DataTables,Jeremy017/DataTables,Lao-liu/DataTables,mrkz55/DataTables,wesleifreitas/DataTables,jochouen/DataTables,Rise-Vision/DataTables,nandadotexe/DataTables,saipuli/DataTables,ilovezy/DataTables,stevewithington/DataTables,estcode/DataTables,BobJavascript/DataTables,riyaze/DataTables,Rise-Vision/DataTables,nickzhuyb/DataTables,modulexcite/DataTables,fashionsun/DataTables,cyberhobo/column-filter-widgets-examples,57134898/DataTables,idleog/DataTables,ilovezy/DataTables,modulexcite/DataTables,scottyaslan/DataTables,rtrinidad/DataTables,BobJavascript/DataTables,jochouen/DataTables,nickzhuyb/DataTables,montrothstein/DataTables,aihua/DataTables,wwwcs59/DataTables,ilovezy/DataTables,cbondo/DataTables,sayfulit/DataTables,michalsnik/DataTables,57134898/DataTables,michalsnik/DataTables,Jeremy017/DataTables,BobJavascript/DataTables,scottyaslan/DataTables,stevewithington/DataTables,estcode/DataTables,champsupertramp/DataTables,wwwcs59/DataTables,wwwcs59/DataTables,fashionsun/DataTables,rtrinidad/DataTables,Golfer/DataTables,wesleifreitas/DataTables,witcxc/DataTables,susith8/DataTables,Jeremy017/DataTables,cbondo/DataTables,michalsnik/DataTables,fashionsun/DataTables,nickzhuyb/DataTables,cyberhobo/column-filter-widgets-examples,idleog/DataTables,witcxc/DataTables,vermaslal/DataTables,57134898/DataTables,jochouen/DataTables,estcode/DataTables,performancematters/DataTables,modulexcite/DataTables,jeffi1011/DataTables,stevewithington/DataTables,vermaslal/DataTables,champsupertramp/DataTables,champsupertramp/DataTables,wesleifreitas/DataTables,scottyaslan/DataTables,cbondo/DataTables,vermaslal/DataTables