auto merge of #4229 : mttr/servo/mach_unit_test_select_component, r=Manishearth
auto merge of #4229 : mttr/servo/mach_unit_test_select_component, r=Manishearth

Example usage:

`./mach test-unit -c style`

jimberlage/servo,samfoo/servo,emilio/servo,pyfisch/servo,paulrouget/servo,chotchki/servo,youprofit/servo,nrc/servo,fiji-flo/servo,meh/servo,mattnenterprise/servo,huonw/servo,saratang/servo,zentner-kyle/servo,rnestler/servo,avadacatavra/servo,KiChjang/servo,A-deLuna/servo,youprofit/servo,peterjoel/servo,vks/servo,huonw/servo,dsandeephegde/servo,dagnir/servo,emilio/servo,mbrubeck/servo,KiChjang/servo,upsuper/servo,aweinstock314/servo,emilio/servo,peterjoel/servo,brendandahl/servo,CJ8664/servo,emilio/servo,cbrewster/servo,meh/servo,DominoTree/servo,larsbergstrom/servo,rentongzhang/servo,emilio/servo,larsbergstrom/servo,echochamber/servo,DominoTree/servo,srbhklkrn/SERVOENGINE,paulrouget/servo,fiji-flo/servo,kindersung/servo,notriddle/servo,sadmansk/servo,samfoo/servo,rentongzhang/servo,Adenilson/prototype-viewing-distance,paulrouget/servo,srbhklkrn/SERVOENGINE,tschneidereit/servo,anthgur/servo,indykish/servo,snf/servo,wartman4404/servo,tempbottle/servo,mattnenterprise/servo,zhangjunlei26/servo,zentner-kyle/servo,upsuper/servo,bjwbell/servo,meh/servo,SimonSapin/servo,indykish/servo,anthgur/servo,GreenRecycleBin/servo,thiagopnts/servo,vks/servo,codemac/servo,ryancanhelpyou/servo,runarberg/servo,nnethercote/servo,runarberg/servo,rentongzhang/servo,aidanhs/servo,saneyuki/servo,saneyuki/servo,DominoTree/servo,runarberg/servo,peterjoel/servo,rixrix/servo,thiagopnts/servo,AnthonyBroadCrawford/servo,DominoTree/servo,s142857/servo,emilio/servo,vks/servo,deokjinkim/servo,jimberlage/servo,GreenRecycleBin/servo,dvberkel/servo,nick-thompson/servo,jgraham/servo,szeged/servo,jgraham/servo,brendandahl/servo,dhananjay92/servo,sadmansk/servo,ryancanhelpyou/servo,walac/servo,snf/servo,splav/servo,jlegendary/servo,mdibaiee/servo,youprofit/servo,rixrix/servo,g-k/servo,mattnenterprise/servo,rixrix/servo,mdibaiee/servo,kindersung/servo,akosel/servo,Adenilson/prototype-viewing-distance,thiagopnts/servo,tempbottle/servo,eddyb/servo,chotchki/servo,codemac/servo,g-k/servo,dagnir/servo,zhangjunlei26/servo,saratang/servo,walac/servo,upsuper/servo,wartman4404/servo,dvberkel/servo,AnthonyBroadCrawford/servo,mdibaiee/servo,notriddle/servo,saratang/servo,kindersung/servo,splav/servo,indykish/servo,vks/servo,saneyuki/servo,SimonSapin/servo,pgonda/servo,aidanhs/servo,cbrewster/servo,wartman4404/servo,mbrubeck/servo,pgonda/servo,fiji-flo/servo,SimonSapin/servo,nnethercote/servo,akosel/servo,zentner-kyle/servo,dati91/servo,caldwell/servo,ConnorGBrewster/servo,dvberkel/servo,jgraham/servo,rnestler/servo,mbrubeck/servo,GyrosOfWar/servo,paulrouget/servo,deokjinkim/servo,wartman4404/servo,CJ8664/servo,kindersung/servo,ruud-v-a/servo,AnthonyBroadCrawford/servo,eddyb/servo,peterjoel/servo,g-k/servo,canaltinova/servo,GreenRecycleBin/servo,RenaudParis/servo,luniv/servo,GyrosOfWar/servo,A-deLuna/servo,rixrix/servo,rnestler/servo,anthgur/servo,rixrix/servo,steveklabnik/servo,chotchki/servo,dmarcos/servo,youprofit/servo,anthgur/servo,tschneidereit/servo,CJ8664/servo,ryancanhelpyou/servo,emilio/servo,aweinstock314/servo,nick-thompson/servo,brendandahl/servo,akosel/servo,ConnorGBrewster/servo,jdramani/servo,tschneidereit/servo,chotchki/servo,deokjinkim/servo,saneyuki/servo,avadacatavra/servo,tschneidereit/servo,wpgallih/servo,CJ8664/servo,meh/servo,g-k/servo,KiChjang/servo,szeged/servo,echochamber/servo,dati91/servo,runarberg/servo,nick-thompson/servo,aidanhs/servo,splav/servo,rnestler/servo,splav/servo,pgonda/servo,nnethercote/servo,samfoo/servo,mdibaiee/servo,aidanhs/servo,nerith/servo,karlito40/servo,notriddle/servo,jimberlage/servo,steveklabnik/servo,peterjoel/servo,vks/servo,cbrewster/servo,pyfisch/servo,eddyb/servo,codemac/servo,WriterOfAlicrow/servo,mattnenterprise/servo,karlito40/servo,upsuper/servo,larsbergstrom/servo,nerith/servo,CJ8664/servo,paulrouget/servo,SimonSapin/servo,s142857/servo,walac/servo,hyowon/servo,pyfisch/servo,pyfisch/servo,brendandahl/servo,emilio/servo,DominoTree/servo,anthgur/servo,wartman4404/servo,dati91/servo,avadacatavra/servo,tempbottle/servo,AnthonyBroadCrawford/servo,nrc/servo,canaltinova/servo,GreenRecycleBin/servo,jdramani/servo,ryancanhelpyou/servo,saneyuki/servo,steveklabnik/servo,akosel/servo,paulrouget/servo,deokjinkim/servo,codemac/servo,upsuper/servo,aweinstock314/servo,steveklabnik/servo,GreenRecycleBin/servo,zhangjunlei26/servo,ruud-v-a/servo,runarberg/servo,jlegendary/servo,luniv/servo,jlegendary/servo,pyecs/servo,pgonda/servo,karlito40/servo,GyrosOfWar/servo,codemac/servo,cbrewster/servo,dmarcos/servo,runarberg/servo,dagnir/servo,peterjoel/servo,brendandahl/servo,bjwbell/servo,saratang/servo,thiagopnts/servo,jgraham/servo,tempbottle/servo,brendandahl/servo,rixrix/servo,jimberlage/servo,dati91/servo,mattnenterprise/servo,jdramani/servo,hyowon/servo,mbrubeck/servo,nick-thompson/servo,samfoo/servo,nrc/servo,echochamber/servo,jlegendary/servo,thiagopnts/servo,sadmansk/servo,pgonda/servo,meh/servo,wpgallih/servo,huonw/servo,echochamber/servo,aweinstock314/servo,aidanhs/servo,DominoTree/servo,fiji-flo/servo,paulrouget/servo,Adenilson/prototype-viewing-distance,tempbottle/servo,vks/servo,ConnorGBrewster/servo,caldwell/servo,Adenilson/prototype-viewing-distance,dati91/servo,walac/servo,codemac/servo,notriddle/servo,notriddle/servo,youprofit/servo,ConnorGBrewster/servo,evilpie/servo,snf/servo,karlito40/servo,GreenRecycleBin/servo,dhananjay92/servo,zhangjunlei26/servo,dhananjay92/servo,srbhklkrn/SERVOENGINE,srbhklkrn/SERVOENGINE,indykish/servo,splav/servo,nnethercote/servo,DominoTree/servo,CJ8664/servo,bjwbell/servo,karlito40/servo,evilpie/servo,aidanhs/servo,pyecs/servo,szeged/servo,saratang/servo,SimonSapin/servo,dsandeephegde/servo,WriterOfAlicrow/servo,srbhklkrn/SERVOENGINE,jgraham/servo,hyowon/servo,AnthonyBroadCrawford/servo,evilpie/servo,saratang/servo,fiji-flo/servo,pgonda/servo,zentner-kyle/servo,kindersung/servo,tafia/servo,zentner-kyle/servo,szeged/servo,dati91/servo,dhananjay92/servo,dsandeephegde/servo,rnestler/servo,splav/servo,saratang/servo,mbrubeck/servo,luniv/servo,tafia/servo,akosel/servo,huonw/servo,bjwbell/servo,emilio/servo,nrc/servo,mt2d2/servo,AnthonyBroadCrawford/servo,peterjoel/servo,zhangjunlei26/servo,boghison/servo,indykish/servo,A-deLuna/servo,nick-thompson/servo,fiji-flo/servo,indykish/servo,DominoTree/servo,CJ8664/servo,j3parker/servo,saneyuki/servo,wpgallih/servo,jdramani/servo,Adenilson/prototype-viewing-distance,notriddle/servo,luniv/servo,echochamber/servo,mt2d2/servo,szeged/servo,emilio/servo,eddyb/servo,evilpie/servo,dati91/servo,youprofit/servo,hyowon/servo,ruud-v-a/servo,tafia/servo,eddyb/servo,boghison/servo,KiChjang/servo,wartman4404/servo,rentongzhang/servo,dsandeephegde/servo,j3parker/servo,saneyuki/servo,huonw/servo,codemac/servo,tafia/servo,SimonSapin/servo,saneyuki/servo,jdramani/servo,splav/servo,ryancanhelpyou/servo,kindersung/servo,aweinstock314/servo,aweinstock314/servo,pyecs/servo,avadacatavra/servo,AnthonyBroadCrawford/servo,A-deLuna/servo,mattnenterprise/servo,karlito40/servo,WriterOfAlicrow/servo,Adenilson/prototype-viewing-distance,boghison/servo,deokjinkim/servo,nnethercote/servo,huonw/servo,sadmansk/servo,cbrewster/servo,indykish/servo,wartman4404/servo,pyecs/servo,evilpie/servo,zhangjunlei26/servo,mt2d2/servo,A-deLuna/servo,KiChjang/servo,nick-thompson/servo,wpgallih/servo,notriddle/servo,aidanhs/servo,dhananjay92/servo,A-deLuna/servo,akosel/servo,pgonda/servo,aweinstock314/servo,eddyb/servo,upsuper/servo,mattnenterprise/servo,dvberkel/servo,mt2d2/servo,KiChjang/servo,rnestler/servo,ryancanhelpyou/servo,deokjinkim/servo,fiji-flo/servo,RenaudParis/servo,g-k/servo,dmarcos/servo,mdibaiee/servo,dmarcos/servo,boghison/servo,dsandeephegde/servo,s142857/servo,thiagopnts/servo,dsandeephegde/servo,bjwbell/servo,notriddle/servo,dati91/servo,splav/servo,jgraham/servo,pyfisch/servo,rixrix/servo,canaltinova/servo,jlegendary/servo,boghison/servo,szeged/servo,jimberlage/servo,kindersung/servo,eddyb/servo,saneyuki/servo,avadacatavra/servo,jimberlage/servo,pyecs/servo,steveklabnik/servo,saneyuki/servo,cbrewster/servo,caldwell/servo,pyecs/servo,tschneidereit/servo,paulrouget/servo,KiChjang/servo,szeged/servo,eddyb/servo,pyfisch/servo,nerith/servo,echochamber/servo,j3parker/servo,GyrosOfWar/servo,j3parker/servo,runarberg/servo,dagnir/servo,nnethercote/servo,boghison/servo,KiChjang/servo,dsandeephegde/servo,peterjoel/servo,rentongzhang/servo,ConnorGBrewster/servo,CJ8664/servo,mbrubeck/servo,RenaudParis/servo,KiChjang/servo,steveklabnik/servo,peterjoel/servo,upsuper/servo,GreenRecycleBin/servo,GyrosOfWar/servo,echochamber/servo,WriterOfAlicrow/servo,zentner-kyle/servo,nerith/servo,mattnenterprise/servo,nerith/servo,brendandahl/servo,indykish/servo,nrc/servo,nnethercote/servo,rnestler/servo,larsbergstrom/servo,canaltinova/servo,rnestler/servo,notriddle/servo,jgraham/servo,dagnir/servo,dsandeephegde/servo,rixrix/servo,pyfisch/servo,tafia/servo,walac/servo,splav/servo,jdramani/servo,evilpie/servo,larsbergstrom/servo,ConnorGBrewster/servo,samfoo/servo,tempbottle/servo,karlito40/servo,s142857/servo,steveklabnik/servo,rentongzhang/servo,szeged/servo,wpgallih/servo,meh/servo,walac/servo,snf/servo,nick-thompson/servo,SimonSapin/servo,j3parker/servo,snf/servo,larsbergstrom/servo,avadacatavra/servo,larsbergstrom/servo,mt2d2/servo,DominoTree/servo,g-k/servo,jimberlage/servo,meh/servo,j3parker/servo,DominoTree/servo,nnethercote/servo,mt2d2/servo,sadmansk/servo,WriterOfAlicrow/servo,huonw/servo,tschneidereit/servo,GyrosOfWar/servo,deokjinkim/servo,walac/servo,WriterOfAlicrow/servo,GreenRecycleBin/servo,pyfisch/servo,indykish/servo,vks/servo,anthgur/servo,dvberkel/servo,avadacatavra/servo,dmarcos/servo,mt2d2/servo,mbrubeck/servo,notriddle/servo,thiagopnts/servo,dvberkel/servo,ConnorGBrewster/servo,zhangjunlei26/servo,srbhklkrn/SERVOENGINE,pyfisch/servo,canaltinova/servo,ruud-v-a/servo,zhangjunlei26/servo,caldwell/servo,dvberkel/servo,jimberlage/servo,caldwell/servo,anthgur/servo,chotchki/servo,dagnir/servo,splav/servo,nerith/servo,boghison/servo,dmarcos/servo,RenaudParis/servo,cbrewster/servo,evilpie/servo,bjwbell/servo,sadmansk/servo,luniv/servo,larsbergstrom/servo,tafia/servo,paulrouget/servo,wpgallih/servo,sadmansk/servo,pyecs/servo,szeged/servo,KiChjang/servo,evilpie/servo,snf/servo,dhananjay92/servo,szeged/servo,jimberlage/servo,g-k/servo,canaltinova/servo,samfoo/servo,mdibaiee/servo,tempbottle/servo,luniv/servo,pyfisch/servo,SimonSapin/servo,sadmansk/servo,nrc/servo,anthgur/servo,youprofit/servo,RenaudParis/servo,zhangjunlei26/servo,s142857/servo,caldwell/servo,tafia/servo,samfoo/servo,nrc/servo,ruud-v-a/servo,nerith/servo,akosel/servo,canaltinova/servo,dhananjay92/servo,nnethercote/servo,larsbergstrom/servo,paulrouget/servo,A-deLuna/servo,GyrosOfWar/servo,fiji-flo/servo,tschneidereit/servo,ConnorGBrewster/servo,srbhklkrn/SERVOENGINE,rixrix/servo,dagnir/servo,hyowon/servo,WriterOfAlicrow/servo,GreenRecycleBin/servo,chotchki/servo,RenaudParis/servo,hyowon/servo,dmarcos/servo,avadacatavra/servo,s142857/servo,Adenilson/prototype-viewing-distance,nnethercote/servo,upsuper/servo,mdibaiee/servo,rentongzhang/servo,hyowon/servo,caldwell/servo,snf/servo,mbrubeck/servo,s142857/servo,RenaudParis/servo,zentner-kyle/servo,canaltinova/servo,jdramani/servo,luniv/servo,wpgallih/servo,ryancanhelpyou/servo,j3parker/servo,evilpie/servo,jlegendary/servo,cbrewster/servo,bjwbell/servo,jlegendary/servo,peterjoel/servo,wpgallih/servo,thiagopnts/servo,larsbergstrom/servo,ruud-v-a/servo,wpgallih/servo