Added exception .pbo files and updated pbo command line with -N param

.gitignore

@@ -31,4 +31,7 @@
 *.app
 
 #Temp Folder
-Missions/Temp/*
+Missions/Temp/*
+
+#Mission Files pbo
+*.pbo

Util/Mission Merger/mission_merger.py

@@ -38,7 +38,7 @@ for name in mission_files:
         mkpath(tmp_dir)
         copy_tree(src_dir, tmp_dir)
         copy_tree(script_files, tmp_dir)
-        subprocess.call([pbo_tool, "-P",tmp_dir])
+        subprocess.call([pbo_tool, "-PN",tmp_dir])
 
 #Get list of tmp dir after being populated		
 pbo_files = listDir(tmp_file)