Merge branch 't3_requests'
ticket:8 tests
ticket:8 implementation
Merge branch 't8_tags'
ticket:8 hotfix
ticket:9 tests
ticket:9 implementation
Merge branch 't9_management'
ticket:10 tests
ticket:10 implementation
Merge branch 't10_signals'
Merge branch 'master' into t3_requests
ticket:3 elemenate extra database query