Removed check of variable on dict.

[Bernardoow]

I read the code and saw the params of function add_marker is a dict. So, the unpack of variable, check and put on the dict again (I think) is a redunt and then I removed this.

This modification can break code because some ppl maybe use this function to add lat and lng out of build_markers function. But I suggest to remove this variable of param function and let just pass through the kwargs.

I checked on the examples if some call the function add_marker, but I didn't find the call.

[Riverfount]

Hi @Bernadoow,

Please, fix the files conflicts! After it we can do the rebase!