Minor spelling/grammar in comments
Forgot one more can_cache_declaration declaration.

The queues are still being cached because of the auto_delete=True.
mongodb transport - evaluate connection
Adds Len Buckens to AUTHORS
Adds Len Buckens to AUTHORS
Bumps version to 3.0.21 and updates Changelog
MongoDB tests must not connect to mongod
Updates Changelog
Merge branch '3.0'

Conflicts:
	README.rst
	kombu/__init__.py
	kombu/transport/mongodb.py