[XLA] Add support for dumping computations during CompileAheadOfTime. Remove '/' and '\' characters from path names of dumped graphs.
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Add a function to create training variable slots from an initializer. Use it from the Adagrad optimizer.
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* Updated the existing landing page for Install.
* Updated leftnav_files for Deploy, Extend, and Tutorials.
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Add some random test data that unveiled a bug.
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It's okay to import graphs containing deprecated ops.

Fixes #8396
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Changed order of files in leftnav_files for Programmer's Guide.
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Also added some simple tests.
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Substract back temp memory for reduction op because its temp memory becomes output memory.
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[TF:XLA] Implement ResourceApplyAdagrad. Split XLA implementation of training ops into their own file.
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The original implementation was modeled after TensorFlow's existing ApplyAdamNonCuda and ExponentialMovingAverage classes, which are designed for concurrent lockless updates. However, my model training jobs kept failing with NaN errors when I ran them with more than 20 workers. Upon closer investigation, I discovered that the moving average implementation had two problems:

1) In some cases, the moving average of a sequence of positive numbers can actually be negative. If we take the square root of the moving average, we end up with NaN errors. This happened to me with the moving average variable 'v' in the Adam algorithm.

2) When the moving average decay rates \beta_1 and \beta_2 are significantly less than one and the number of workers is large, the moving averages can become unstable, receiving huge updates from each worker. These instabilities become larger and larger until they cause the model training jobs to crash with NaN errors.
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Added integration test of Estimator. It shows the complete flow: train, evaluate, predict, and export. It can be used as a documentation/reference.
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Change the code that builds zero slots in slot_creator.py to use a zeros_initializer rather than Tensor, to simplify Python code that works with multiple graphs.
Implement ResourceApplyMomentum in the XLA bridge.
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  community/welcome.md page.  Revised the content about where to
  ask questions, report issues, and so on.
* Re-added BibTeX entry to bib.md
* Created an attribution.md page to hold legal info.
* Created landing pages at community/index.md and about/index.md
  to following same format as landing pages for the rest of the site.
* Updated community/leftnav_files and about/leftnav_files to reflect
  new files.
* Moved info about the model zoo to about/uses.md page.
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