Panels integration

Hi everybody,

I decided to introduce Panels integration for this module.
Yes, I know with the current version it is possible to insert a simple block in the Panel, but I used a totally different approach and created a custom and reusable panel pane and tweaked a few things in the module.

What are the features?

1) You can use multiple map instances on the same page. (see screenshot)
2) Each map instance can have it's own configuration.
3) Each map instance has a wrapper with unique ID (In case you want to attach a kitten to just one specific map).
4) Improved validation.
5) Address field is not required when you configure the pane - you can either use address or if it's empty then pane will use the coordinates. I really think the same way has to be used in the original logic.

In order to do this I had to tweak the initial code. Basically, settings array now has "container" element, which specifies a unique container for a certain map.
I also swapped body and footer div IDs to CLASS, which means that if you apply this patch then you have to watch out for your styling of body and footer - just tweak your styles to use class selectors instead of id selector.

ALSO, I removed width and height settings from the configuration form, and that is for the reason that I described here:
https://www.drupal.org/node/2487792 (I will try to suggest a patch asap).

Steps to get it working:

1) Apply the patch.
2) Clear cache.
3) Go to your panel and add "Location Map" pane from "Miscellaneous" category.
4) Edit your pane settings to configure your map.
5) Add more "Location Map" panes. And more...and more!

Well, I hope this will be useful for anyone. Any thoughts on this?
Cheers