Merge pull request pyscf#265 from sunqm/master

1.6 release

Merge pull request pyscf#263 from sunqm/master

1.5.5 release

Update version id to 1.5.4

1.5.3 release

Update version info

1.5.1 release

Update setup.py

1.5 beta release

pyscf-1.4.7 release

PySCF-1.4.5 release