Uuv_simulator: Release for melodic

Hi @Timple, I am already working on this. I have Travis building the package for melodic currently. I only have to figure out a dependency (message_to_tf) that hasn't been released for melodic. When I fix this I can make the release.

I would really like to see this too. Is it possible to create a work around with robot localization for now?

I am looking into reimplementing or including the necessary module in this package to solve this problem. It is basically only one .cpp file so it seems to me that including it with the proper documentation into the uuv_simulator can be justified in order to have the release ready.

I downloaded message_to_tf and it builds just fine. I tried simulating a robot and that also worked fine.

I also clone the package in the Travis build configuration for melodic. It seems to be the only dependency missing

Hi @Timple, I just made the transfer of the message_to_tf node with proper 3rd party documentation to this repository at #345 so I think once the pre-release tests are run I can start working on the melodic release.

I just did the releases for melodic and lunar yesterday. Things are looking good in the Buildfarm. I think the packages should be out by the next sync.