v0.5.1 changelog

Conflicts:
	bloscpack.py
fix url listed in setup.py
v0.5.2 changelog

Conflicts:
	bloscpack.py
Merge branch 'forwardport-0.5.2'

* forwardport-0.5.2:
  v0.5.2 changelog
  fix url listed in setup.py
  v0.5.1 changelog