Example: add a dataset to the model builder (Rune recognition)

[cacfd3a]

See also #153. Same commits except for the ~2000 rune images. I made a new branch so that the images don't clutter the git history .

was asked to write a tutorial for adding a data set to the model builder. hope you like it

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This change is 

[nsthorat]

This tutorial is fantastic, thank you for putting the effort in. Will merge after these tiny comments :)

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Review status: 0 of 4 files reviewed at latest revision, 5 unresolved discussions, some commit checks failed.

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demos/rune_recognition/generate_train_examples_runes.html, line 93 at r1 (raw file):

  function clearCanvas() {
    ctx.clearRect(0, 0, 320, 320);
    // document.getElementById("canvasimg").style.display = "none";

remove this line

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demos/rune_recognition/generate_train_examples_runes.html, line 150 at r1 (raw file):

      charIndex = (charIndex + 1) % allChars.length;
    }
    console.log("setting char " + charIndex);

remove this

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demos/rune_recognition/rune_recognition.md, line 8 at r1 (raw file):

# Example: Add a new data set to the model builder demo

In this tutorial we add a data set to the [model builder demo](https://pair-code.github.io/deeplearnjs/demos/model-builder/model-builder-demo.html) and train a neural network that can recognize individual glyphs of runes. It is similar to the canonical [MNIST example](https://www.tensorflow.org/get_started/mnist/pros) for recognizing handwritten digits, but with a different alphabet. This tutorial is meant as a minimal scaffold to start off your adventures in deep learning.

link to deeplearnjs.org now instead of the old base URL

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demos/rune_recognition/rune_recognition.md, line 150 at r1 (raw file):

## Modify model builder demo

(See also the [development pointers](https://pair-code.github.io/deeplearnjs/#development))

link to deeplearnjs.org now instead of the old base URL

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demos/rune_recognition/rune_recognition.md, line 154 at r1 (raw file):

First we verify that we can run the model builder. From the project root, run:

* `npm install`

can you make this "npm run prep", we need to install bower components for the model builder to work too

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Comments from Reviewable

[cacfd3a]

Thank you! I've processed the feedback.

[nsthorat]

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Reviewed 2 of 4 files at r1, 2 of 2 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable