Clarifying build and run instructions

[ruffsl]

Building from a fetch platform, I found I was missing a lot of runtime dependencies, that catkin build was not warning me about. Might be useful to remind users and the use of :

rosdep install --from-paths src --ignore-src --rosdistro=indigo -y

Looks like the only missing runtime dependency from the package.xml was the couchdb package,
As noted in #5

Also for runtime,
It looks like you are installing nvm locally using those creationix/nvm scripts, which is cool as it avoids the hole debian nodejs packging debocle. But it subtly adds the paths for nvm and nodejs to the tail of the user's ~/.bashrc. So you may want to remind users to resource their ~/.bashrc so the javascript executables can find nodejs before you try and roslaunch fetch_pbd_interaction.

[velveteenrobot]

Thanks for letting us know! Hopefully fixed now.