Collage for website and README

[jlstevens]

Adding a collage of nice examples to the website and README.

[jbednar]

Looks good!

[jlstevens]

Here is the preview when done from master (the preview from the PR doesn't spread across rows for some reason):

[jlstevens]

This would be a good time to upload the logo so we can put it next to the HoloViews header (I suggest capitalizing it). Would also be good to update the entire README...

[jlstevens]

@philippjfr @jbednar Any idea how to get the logo on the same line as the heading in rst? I get this which is ugly:

using:

.. raw:: html

     <img src="http://assets.holoviews.org/logo/holoviews_color_icon_500x500.png" alt="HoloViews logo" height="70px" />

HoloViews
=========

It is possible (at least with Markdown). See nteract's README for instance.

[jbednar]

No idea. Should the gallery include at least one plot showing a set of numerical sliders on a HoloMap (or DynamicMap)? That's such a big selling point of HV that it's odd it's not included here.

[jlstevens]

Should the gallery include at least one plot showing a set of numerical sliders on a HoloMap (or DynamicMap)

Do you think it has to be animated? Or would a static one with a slider get the point across?

[jbednar]

Either is probably fine.

[jlstevens]

In that case I suggest removing the linked stream example in the middle (bottom row) and replacing it with something that has a slider (and maybe some sort of linked stream).

[jlstevens]

Updated to show one with a slider:

[jlstevens]

@philippjfr @jbednar Are we happy with this before I convert the README to markdown?

[philippjfr]

@philippjfr @jbednar Are we happy with this before I convert the README to markdown?

Can we make the bottom row a tiny bit larger, basically scale them all up until their overall width right-aligns with the legend of the top row. Could even add a little bit of whitespace to the top row to give you more scope to scale up the bottom row.

[jlstevens]

All the examples in this collage are now examples in #1537. I would like to update some of the thumbnails which have changed and add links to where these examples will be before this PR is merged.

Edit: Not quite true - the cell's example is from the getting started guide. Probably not worth turning into an example? What do you think @philippjfr ?

[jlstevens]

This PR will address #1596 once merged.

[jlstevens]

Every image in the collage now links to the page where that example can be found.

Note that the http://build.holoviews.org urls will need to be replaced with http://holoviews.org once the website is live. As we need to update the homepage with new content in a separate PR, this doesn't need to be changed now.

Here is what it looks like now:

@philippjfr Do you agree we should merge now then finish up the homepage?

[philippjfr]

Happy to merge this now, will still have to optimize file sizes for these but lets get it in place first.

[jlstevens]

The gifsicle utility seems to work well for gifs. Not sure what to do about pngs.

We should optimize these before the final homepage update.

[philippjfr]

I noticed the gifs were still fairly large even after you resized them, going to try a few other things.

[jlstevens]

I resized the gifs so their width was 500 pixels i.e they are still probably larger than they need to be.

[philippjfr]

Generally as long as they don't contain images the gifs compress very well so I'll try some compression tomorrow.