ModifyRectangle - Set corner features in cache item

[adube]

This PR is a small fix for the ngeo.interaction.ModifyRectangle interaction. The corner features were put in the feature's own properties, which was causing issues with the permalink.

Now, the corners are stocked in a cache item instead.

Live example

• http://adube.github.io/ngeo/fix-ngeo-modify-rectangle-corners/examples/contribs/gmf/drawfeature.html?rl_features=Fa(edkt_ccb5!nwknB..5x59*mwknB.~isRectangle*true%27name*Rectangle%25201%27color*%2523DB4436%27angle*0%27opacity*0.2%27showMeasure*false%27size*10%27stroke*1)&map_x=0&map_y=380882&map_zoom=3

[adube]

@fredj Ready for review/merge.

[adube]

I added a live example, which confirms that the issue disappeared. (we used to have object[Object] in the url. They are no longer there).

[fredj]

LGTM, can you please check if it works in compiled mode? I've a doubt that:

var item = {
  corners: pointFeatures
}

Is correctly detected as a ngeo.interaction.ModifyRectangle.CacheItem by the compiler

[adube]

It does work, but it's never bad to cast the type (for a dev point of view, it also tells what it is). I'll do this right away.

[adube]

Done. I'll let you know once Travis passes.

[adube]

Travis passes.

[fredj]

Thanks @adube