Add datastore_test/ to gitignore
Fix name collision in download_test_datastore script

It imported date from datetime, but also used date as variable
Now just import datetime
Rename numberOfPlate to detector_n in fitting script
PEP8 fixes in various files

Make the two dates and the station global variables in histogram tests
Correct date in docstring for …new_events_at_the_end_of_epoch
Nicely handle other files in the datastore

There should not be anything else, but just in case handle it.
On a Mac the Finder likes to create .DS_Store files.
These will be found by the os.walk, but do not fit the format for
strptime.
This try/except nicely ignores files with the wrong name format.