Revert "Remove Routes 5 and 6"

This reverts commit e0ec6bbc83451d2223c8bebf4a382da0192d6820.
Remove trips with assigned route numbers 5 and 6.
Merge pull request #4 from seabre/fix-trips

Fix trips.txt: When removing trips with assigned routes 5 and 6, file was converted to TSV instead of CSV.