Ignore more (especially Xcode 4) Xcode noise.

 build
-*.pbxuser
-*.mode1v3
+*xcodeproj/*mode*
+*xcodeproj/*pbxuser
+*xcodeproj/*per*
+*xcodeproj/project.xcworkspace
+*xcodeproj/xcuserdata
+*tmproj
 .DS_Store
+profile
+