Release 3.0.2

 - Ensure newly uploaded files do not exist before adding them to the DB
 - Update file modification time instead of overwriting it with it's own data
   when a file is uploaded multiple times
 - Minor changes:
   + Support values that are not multiples of one day for upload_max_age
   + Add config settings for testsuite to example configs
   + Include most php extension dependencies in composer.json
   + Use dedicated, temporary upload directory for testsuite
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