Script runall migrations

Merged Karsten Prehn requested to merge script-runall-migrations into master

Wrote this small shell script that deletes the current obm_tiles database, re-creates it and then runs through all sql scripts in the migrations folder and executes them. Will come in handy as the number of sql scripts grows. Of course, locations of the script and code is up for debate.

\approve @fd @marius @ds @nicgar

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