Changes:
- Some changes to make our ability to handle external contributions
simpler (e.g., adding some markers, adding empty __init__.py files).
- Fixing documentation of SummaryWriter.add_summary().
- Some input validation changes for queues/barriers.
- Fixing the ptb tutorial (thanks to @kentonl for reporting),
fixes, github issue 52.
- Some documentation suggestions for dealing with a few install
problems.
- Speed improvements to conv2d gradient kernels on CPU.
- More documentation fixes for the website. Thanks to @makky3939 and
@keonkim for reports.
- Changes / fixes to the Docker files.
- Changes build_pip_package to not create an sdist.
- Adds tensorboard example script.
Base CL: 107445267
