Merge pull request chainer#952 from pfnet/v1.6.2

Update to v1.6.2

Merge pull request chainer#909 from pfnet/v1.6.1

Update version

Merge pull request chainer#870 from pfnet/fix-numpy-version

Fix supported numpy version

Merge pull request chainer#745 from pfnet/v1.5.1

Change version

Merge pull request chainer#675 from pfnet/1.5.0

Change version

Merge pull request chainer#615 from pfnet/1.4.1

Change version

Merge pull request chainer#564 from pfnet/v1.4

version 1.4.0

Merge pull request chainer#452 from pfnet/1.3.2

v1.3.2

Merge pull request chainer#416 from pfnet/v1.3.1

v1.3.1

Merge pull request chainer#378 from pfnet/v1.3.0

v1.3.0