update training code

Merge remote-tracking branch 'origin/master'

add sliding prediction for PSPNet (mIOU still not very good)

Merge pull request #18 from adynathos/master

fix relative imports

running 2to3

add sliced prediction for PSPNet

Create LICENSE

update psp net training code

update cityscapes dataset and training codes

update training codes of PSPNet

update training codes and fix a bug of PSP Net

update fcn models and training code

fix bugs of models (consequently using of inplace operation)

fix bugs of training code