Updated rackspace docblocks
Updated rackspace docblocks

oswaldderiemaecker/flysystem,nao-pon/flysystem,rossriley/flysystem,CarsonF/flysystem,farmisen/flysystem,dstockto/flysystem,sachintaware/flysystem,mhlavac/flysystem,mhlavac/flysystem,twistor/flysystem,Amrit01/flysystem,twistor/flysystem,mapyo/flysystem,sohelrana820/flysystem,hannesvdvreken/flysystem,dshafik/flysystem,barryvdh/flysystem