Merge pull request #33 from Crystalnix/FixABugsMaster

Fix a bugs master
While nothing is working. I will decide the issue later.
module of automatically download media files to the database is ready
Minor fixes
Created a parser for ozon.ru
Fixed a issues
Fixed all issues and added interface of admin for FileStorage
Fixed some issues.
Added new header in parsers.py
Fixed a some issues.
Fixed issues.
Fixed a issues
Created an unit test for DatabaseStoragePostgres.
Updated requirements.txt
Сorrected an unit tests for DataBaseStoragePostgres
Created an unit tests for AmazonParser and OzonParser.
Manager  can to easily move requested books to the book list in his library
Corected an unit tests.
Corrected an unit tests.
Fixed issues.