REL: set version to 0.9.0.

REL: set released=True in setup.py (for 0.9.0rc5).

REL: set version number to 0.9.0rc4.

REL: set version number to 0.9.0rc3.

REL: set version number to 0.9.0rc2

REL: set version number to 0.9.0rc1, released=True

REL: set version to 0.9.0b1

REL: Change version number to 0.8.0

REL: Set version number to 0.8.0rc3.

REL: Change version number on 0.8.x branch to 0.8.0rc2.