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TensorBoard.
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ever specified by clients, so remove the use of RE2, but leave
comments explaning what we would do.

Also remove unnecessary includes of regexp.h in other files.
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logic.
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* Introduce a simple plugin architecture for plugins to add their HTTP handlers and data to TensorBoard. Each plugin implements a simple interface defined in base_plugin.py. Each plugin P exports its own API methods to tf.tensorboard.plugins.P

* The goal of this plugin system is minimal coupling between tensorboard and plugins so we can remove tensorboard/plugins/... later and replace it with the new plugin architecture - only 10 lines of code added to tensorboard/backend/handler.py will need to be removed.

* Add and register the embedding projector under the name `projector`. Also export tf.contrib.tensorboard.plugins.projector.visualize_embeddings(summary_writer,config) to the tensorflow API.

* The embedding projector writes its own data in a separate file but in the same logdir as the summary writer.
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This is similar in spirit to the python __future__ module.
Proactive users who want to minimize burden when upgrading
tensorflow would insert the following snippet:
from tensorflow.python.util import future_api
after importing tensorflow. That would prevent them from
inadvertently using symbols that should disappear in future
versions, such as tf.arg_max.
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whenever possible.
Also delay the creation of the cost model until all the operations for a given step are run: this should minimize the impact the the overall execution, and therefore result in more accurate statistics.
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to every call site.
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This change does the following:

- Always use {,new_}http_archive rather than git_repository
- Make liberal use of strip_prefix
- Clarify licenses() in BUILD files
- On POSIX include headers like a normal C/C++ program

This change accomplishes the following:

- Reduce download size >100MB: The biggest culprit is grpc which has
  tens of thousands of commits in its GitHub repository.

- Reduce disk size >200MB: On disk, grpc takes up 250MB when cloned even
  though the tarball of the git repo is 3.2MB. By never using git
  externals, we save on network.

- Consume less cpu: Cloning git repositories is much slower than
  downloading and extracting a tarball.
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location.
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Before: 1min 33s
After 30s
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On GPU, it's hard to get error metrics back, so we continue to return NaNs.
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