Fixing issue with file.expandFiles where input arrays were not flattened and results were not uniqed.
Fixing issue with file.expandFiles where input arrays were not flattened and results were not uniqed.

shama/grunt,coldrye-collaboration/grunt,vladikoff/grunt,youmyyou/grunt,abraheem/grunt,arosa81/grunt,paulcbetts/grunt,modulexcite/grunt,lkiarest/grunt,JaKXz/grunt,FeodorFitsner/grunt,r14r/fork_grunt_master,eelve/grunt,thecc4re/gruntjs,goodeggs/grunt,felixgrey/grunt,imjerrybao/grunt,yonglehou/grunt,yosiazwan/grunt,fscherwi/grunt,zackexplosion/grunt,pandeysoni/grunt,r14r-work/fork_grunt_master,thejameskyle/grunt,q310550690/grunt,IveWong/grunt,Chhunlong/grunt,ThiagoGarciaAlves/grunt,yuhualingfeng/grunt,paladox/grunt