Merge branch 'master'

Conflicts:
	ChangeLog.txt
	config.mk
	src/context.c
	src/loop.c
	src/subs.c
	test/broker/01-connect-bad-packet.py
	test/broker/02-subpub-qos1-bad-pubcomp.py
	test/broker/02-subpub-qos1-bad-pubrec.py
	test/broker/02-subpub-qos2-bad-puback-1.py
	test/broker/02-subpub-qos2-bad-puback-2.py
	test/broker/02-subpub-qos2-bad-pubcomp.py
	test/broker/02-subpub-qos2.py
	test/broker/07-will-null-topic.py