Add Netbeans project file to gitignore
Add Netbeans project file to gitignore

Also categorised the ignore file. Only the "nbproject/*" is new.
pratikshashroff/pcura,markwal/CuraEngine,totalretribution/CuraEngine,Ultimaker/CuraEngine,ROBO3D/CuraEngine,markwal/CuraEngine,totalretribution/CuraEngine,pratikshashroff/pcura,totalretribution/CuraEngine,Ultimaker/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,alephobjects/CuraEngine,pratikshashroff/pcura,markwal/CuraEngine,ROBO3D/CuraEngine,alephobjects/CuraEngine