changed 'p.my_file' to 'p.MY_FILE'

my_file is lowercase when it is uppercase in the parse file. I also checked in the file for map.py and it's p.MY_FILE, so this is probably a typo :-).
fix typo, its should be fourth

the length of variable was 3, then comes the <del>fifth</del> fourth variable `ITEM_PIPELINES`
Merge branch 'pr/100'
merge #98