Classification demos improvement

[dvalcarce]

Changes:

• Adds perceptron demo.
• Adds color bar for all demos.

[dvalcarce]

What do you think?

[dvalcarce]

The black countour lines of these pictures are the best I can get from conrec.js

The alternative I've found (d3.geom.contour plugin) doesn't convince me, I think conrec.js is far superior.

[sonney2k]

hmmhh it looks certainly better but maybe we should really redo this from the beginning in d3 to have our own nice contour & heatmap plot

[dvalcarce]

I removed some transparencies. Contour lines are truly black.

[sonney2k]

I like it a lot now! The colorbar could use some more values (maybe you do them horizontally but it looks cool :+1:

[sonney2k]

closing as this is now merged in shogun-toolbox/shogun-demo