Merge branch 't4' into t5

Conflicts:
	apps/hello/admin.py
	apps/hello/tests/test_context_processors.py
	apps/hello/tests/test_middleware.py
	apps/hello/tests/test_views.py
	apps/hello/tests/utils.py
	apps/hello/views.py
ticket:5 flake8
ticket:8 implemented template teg to render a link to an edit page in admin interface
ticket:9 implemented management command which writes out a count of each registered django model
ticket:9 wrote a bash script which executes instances_count management command and redirects it's a stderr output to a file
ticket:9 added test for instances_count management command
ticket:9 made script shebang line refer to bash instead of sh
ticket:9 Merge branch 't9'