Fix test suite CSS for IE
Fix test suite CSS for IE

By default, all static files served from the test server were
"text/plain". IE auto-detects HTML and JavaScript content as such, but
refuses to display the style sheet until it is served as "text/css".

JhansiYarnagula/dummy2,gdamjan/fetch,niftylettuce/fetch,chrisbaldwinj/fetch,gdamjan/fetch,hilongjw/fetch,net-engine/fetch,net-engine/fetch,niftylettuce/fetch,dkfiresky/fetch,bmakuh/fetch,kevin-klein/fetch,othree/fetch,camsong/fetch-ie8,pluma/fetch,zebulonj/fetch-plus,atma/fetch-compat,cloderic/fetch,kirill-konshin/fetch,jezell/fetch,kruppel/fetch,slang800/fetch,keyanzhang/fetch-xhr,othree/fetch,ziir/fetch,kevin-klein/fetch,keyanzhang/fetch-xhr,Driftt/fetch,mitchellmebane/GM_fetch,othree/fetch,github/fetch,kruppel/fetch,colonsong/fetch,colonsong/fetch,JhansiYarnagula/dummy2,lagden/fetch,kirill-konshin/fetch,kevin-klein/fetch,radnor/fetch,JhansiYarnagula/dummy2,snadn/fetch,chengky/fetch,camsong/fetch-ie8,undoZen/fetch,tanzhihang/fetch,kruppel/fetch,gdamjan/fetch,othree/fetch,radnor/fetch,SenecaSystems/fetch,SenecaSystems/fetch,bmakuh/fetch,kirill-konshin/fetch,aleclarson/fetch,net-engine/fetch,Driftt/fetch,slang800/fetch,net-engine/fetch,radnor/fetch,snadn/fetch,dkfiresky/fetch,undoZen/fetch,cloderic/fetch,chrisbaldwinj/fetch,SenecaSystems/fetch,rektide/fetch,tanzhihang/fetch,steveluscher/fetch,pluma/fetch,Driftt/fetch,rektide/fetch,rektide/fetch,bmakuh/fetch,lagden/fetch,undoZen/fetch,chengky/fetch,undoZen/fetch,camsong/fetch-ie8,atma/fetch-compat,ziir/fetch,chrisbaldwinj/fetch,chengky/fetch,u9520107/fetch,cloderic/fetch,snadn/fetch,jezell/fetch,radnor/fetch,chengky/fetch,lagden/fetch,steveluscher/fetch,ziir/fetch,atma/fetch-compat,hilongjw/fetch,zebulonj/fetch-plus,addyosmani/fetch,niftylettuce/fetch,kirill-konshin/fetch,colonsong/fetch,ziir/fetch,heruan/fetch,SenecaSystems/fetch,pluma/fetch,benestudio/fetch,camsong/fetch-ie8,mvader/fetch,slang800/fetch,u9520107/fetch,heruan/fetch,jezell/fetch,kevin-klein/fetch,heruan/fetch,jezell/fetch,benestudio/fetch,steveluscher/fetch,hilongjw/fetch,u9520107/fetch,kruppel/fetch,pluma/fetch,steveluscher/fetch,cloderic/fetch,tanzhihang/fetch,colonsong/fetch,mvader/fetch,tanzhihang/fetch,gdi2290/fetch,addyosmani/fetch,bmakuh/fetch,slang800/fetch,rektide/fetch,gdi2290/fetch,zebulonj/fetch-plus,gdamjan/fetch,chrisbaldwinj/fetch,hilongjw/fetch,lagden/fetch,dkfiresky/fetch,benestudio/fetch,atma/fetch-compat,mvader/fetch,mvader/fetch,matthew-andrews/fetch,keyanzhang/fetch-xhr,matthew-andrews/fetch,u9520107/fetch,snadn/fetch,heruan/fetch