Moved @resolve_connection call into @delay wrapper
Added tests and updated requirements with mock lib.
Removed @resolve_connection from job decorator.

-- resolve_connection already presence inside Queue __init__.
Move mock to test-only dependencies.
Merge remote-tracking branch 'origin/master' into SanyerMyasoedov-master

Conflicts:
	rq/decorators.py
	tests/__init__.py
	tests/test_decorator.py
Merge branch 'SanyerMyasoedov-master'
Fix broken import.