TensorFlow: Doc and linter fixes, some additional tests and error handling, updates to website.
TensorFlow: Doc and linter fixes, some additional tests and
error handling, updates to website.

Changes:
- Removes redundant reshape from image models by @mrry
- Default TensorBoard to localhost by @danmane
- Reformatting of tensorflow/core by @josh11b
- Make tutorials backwards compatible to 0.5.0 by @girving
- Improve print documentation (md files not updated).
- Add proper scrolling to sitemap by @martinwicke

Base CL: 107956254

tensorflow/tensorboard,agrubb/tensorboard,ioeric/tensorboard,tensorflow/tensorboard,agrubb/tensorboard,shakedel/tensorboard,francoisluus/tensorboard-supervise,qiuminxu/tensorboard,francoisluus/tensorboard-supervise,tensorflow/tensorboard,agrubb/tensorboard,tensorflow/tensorboard,ioeric/tensorboard,shakedel/tensorboard,qiuminxu/tensorboard,tensorflow/tensorboard,qiuminxu/tensorboard,shakedel/tensorboard,qiuminxu/tensorboard,tensorflow/tensorboard,shakedel/tensorboard,shakedel/tensorboard,ioeric/tensorboard,agrubb/tensorboard,francoisluus/tensorboard-supervise,shakedel/tensorboard,francoisluus/tensorboard-supervise,qiuminxu/tensorboard,agrubb/tensorboard,ioeric/tensorboard,francoisluus/tensorboard-supervise,ioeric/tensorboard,ioeric/tensorboard,agrubb/tensorboard,tensorflow/tensorboard,qiuminxu/tensorboard,francoisluus/tensorboard-supervise