Major changes in 1.15.3
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* New gnome-online-accounts volume monitor written by Debarshi Ray
* Various test suite fixes and improvements
* tests: Fix tar/zip ArchiveMounter tests
* tests: Fix race condition in Drive tests
* tests: Use apache2 binary directly
* daemon: Implement proper org.gtk.vfs.MountTracker.UnregisterMount()
* mtp: Fix race between on_uevent and do_unmount
* mtp: Fix leaked weak reference on monitors
* cdda: Adapt to new paranoia.h location
* smb: Implement proper unmount method
* computer: Fix volume monitoring
* build: Replace deprecated autoconf macros
* Translation updates