Wms styling

[dorukozturk]

Added an example to style wms raster tiles on the fly via the sld file. We are including visualization specs to the url as a parameter called "SLD_BODY". The UI listens for any change on the forms and updates the map by doing the following steps:

1. Delete the current layer
2. Regenerate the URL using the new parameters
3. Send a GET request with the new visualization parameters

@aashish24 @jbeezley @manthey

[codecov-io]

Current coverage is 78.82%

Merging #595 into master will not change coverage

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[manthey]

I think all of our other example thumb.jpg files are 800x600 pixels in size, so for consistency, we probably want to make this one the same.

[manthey]

We are limiting the color count to 8. Is there some virtue to keeping the entries for >= 9 in the colorbrewer object?

[jbeezley]

I would actually prefer installing this through npm anyway.

[dorukozturk]

I think this is ready for a second review. @manthey @jbeezley

[jbeezley]

It looks much better, thanks. One thing I'm noticing is that the overlay is misaligned a bit. It looks like it is shifted to the north a bit. The tiles are being placed correctly, so it is either a problem with the bounding box computation (in EPSG:3857 coordinates) or the geoserver is misinterpreting them. What's odd is that the other wms example is done the same way, but there doesn't seem to be a similar misalignment.

[dorukozturk]

@jbeezley You are right. There was an error with the projection. I fixed it.

[jbeezley]