Commit to enable true fully convolutional application of network

[warmspringwinds]

Hello,

I have created a pull request to tensorflow/models long time ago
and just want to point out that it will make using TF-Slim easier for
Image Segmentation:
tensorflow/models#684

Is there a chance someone can review it?

Thank you.

[vrv]

I have added reviewers to that PR, thanks.