Added capability to save file backup when file open (without saving)
Changed datetime format from YYYY-MM-DD-HH-MM-SS to YYYY-MM-DD_HH-MM-SS
Merge pull request #6 from LONGMANi/master

Added capability to save file backup when file open (without saving). Changed datetime format from YYYY-MM-DD-HH-MM-SS to YYYY-MM-DD_HH-MM-SS.