(explore) folder name does not match package name (explore_lite)

[Timple]

Typically the folder name of a package should match the package name.

So I would suggest to either rename the package to explore or the folder to explore_lite.

If you indicate your preference I can open a pull request if you like.

[rodebr]

For consistency, I suggest to also rename either the folder map_merge or the package multirobot_map_merge.