Created find_missing.py
Created find_missing.py

Find a missing file i a serie of numbered files. 
Ex directory:
./test
  test 1.txt
  test 2.txt
  test 4.txt
Calling find_missing in this dir will print '3', the missing number in the serie.
FreekKalter/linux-scripts,FreekKalter/linux-scripts,FreekKalter/linux-scripts,FreekKalter/linux-scripts