Fix issue template

Issue template for models.

This broke the bazel build of inception/download_and_preprocess_flowers
The way that this script is written doesn't actually allow it to be ran
outside bazel, some refactoring would be needed if you want to run it
standalone.

It should be ran using

```
bazel build inception/download_and_preprocess_flowers

bazel-bin/inception/download_and_preprocess_flowers
"${FLOWERS_DATA_DIR}"
```

This fixes the 'running as root is not recommended' crash

Fix provide_batch_fn for semi-supervised case.

More DSN updates

Update README.md

I had to figure this one out on my own. Probably belongs in the manual install notes.

Make the README for textsum a little clearer