Move away from using install_dependencies to rosdep

[garethellis0]

Right now we're using a script (install_dependencies)to manually install all dependencies, but CI uses a different (and much better system) where it finds all the requirements from the package.xml files (fairly sure it's rosdep, or something like that anyhow). We should look at what CI is doing (script is located here) and change install_dependencies to just use the same commands that CI does (although it should be kept separate from getting_started to make it easier for people to update all their dependencies after they've setup the repo for the first time

[garethellis0]

After looking into it some more, this should just be a matter of replacing the call to install_dependencies.sh from get_started.sh to our rosdep install command from travis. Alternatively, we may want to keep this command as it's own script (in install_dependencies.sh, so we can have people update dependencies without having to re-run the entire setup script. The travis command in questions is rosdep install -y -q -n --from-paths . --ignore-src --rosdistro kinetic. @ValRat - thoughts?

[garethellis0]

Probably want something more like this actually:

#!/bin/bash

# The current directory
CURR_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

# Installs all required dependencies to build this repo
rosdep install --from-paths $CURR_DIR --ignore-src --rosdistro=ROSDISTRO