Feature/rawgraph - a graph with the real value of a numeric field

Hi,

For specific purpose, I need a graphic panel, like Histogram, but that doesn't make any facet.
I need to see the real evolution of one or more numeric field, with the ponctual and isolated off limits peaks.

So here it is. I created a new component named *rawgraph*.

You can configure it to draw from one to ten series (hard coded limit).
One serie concerns one numeric field. Only one query is made to elasticsearch for all the series.

To limit data exchanged with elasticsearch server, the maximum hits is limited in the panel editor.
I suggest to not request to much data (more than your screen width in pixel would lead to a messy chart).
A message appears if the hits for the period in elasticsearch exceed the limit.

I received good feedbacks from my coworkers and I really think this need should be served by kibana.
However I see three points that doesn't fit with kibana's spirit:

 - If the hits count exceed the limit, only the last chronological hits are shown and the chart's time period is not synchronized with the other panels.
 - Panel series are totally dissociated from dasboard queries
 - The color of a serie can be confusing as it doesn't match to the eventual corresponding query.

Please test it, feedbacks are welcome.
Regards,
Benoît