Make Filesystem->store() throw exception on fail
Make Filesystem->store() throw exception on fail

The StorageOperations expect an exception to be thrown if the write
operation fails, while the Filesystem implementation returns a boolean.
This fixes an issue were a full disk would silently fail and still return
an image identifier.

rexxars/imbo,androa/imbo,matslindh/imbo,imbo/imbo,kbrabrand/imbo,matslindh/imbo,TV2/imbo,TV2/imbo,kbrabrand/imbo,imbo/imbo,rexxars/imbo,androa/imbo