solved issue 10.
10) delete api_gifts and gifts with temp picture urls - that is picture on server
    normally temp pictures will be removed in util.delete_local_picture, but errors can occur
    should be a job for util.new_messages_count or util.missing_api_picture_urls
    process could be:
    1) delete old local pictures.
    2) report missing picture to util.missing_api_picture_urls,
    3) cleanup in util.missing_api_picture_urls
    3/1-2014: temp folder was empty in laptop dev. environment
    19/1-2014: 3 pictures found in temp folder in laptop dev. environment
    22/7-2014: 73 pictures was found in temp folder in laptop. dev. environment
    22/7-2014: no api gifts was found when temp picture urls
    added Picture.cleanup_old_temp_files. Runs once every 100 file upload with temp file