Added rdmanifest file to support installing V-REP by rosdep.

[peci1]

<run_depend>vrep</run_depend> should start working as soon as my pull request to rosdistro is accepted and distributed.
It installs V-REP to /opt/vrep .
If it finds an instance of V-REP in this directory, it doesn't do anything to it (not even update).

[peci1]

If you accept this and ros/rosdistro#8189 is merged, you may consider adding the vrep dependency in package.xmls of your packages.

[jokla]

Thank you @peci1. When ros/rosdistro#8189 is merged we will consider this useful possibility.

Giovanni

[ricsp]

I am not sure this is a good idea.
I should rephrase: it is a certainly useful to have the possibility to install vrep automatically, but I am not sure that we can implement this because of licensing considerations.
V-REP is not free for non-academic users and so we cannot automatically download it if the user does not have the right to the free license.
I am not an expert, but I think we should ask coppelia robotics before accepting this PR.
What do you guys think?