Add square test

[eborghi10]

Description

This PR is part of the milestone to setup robot_localization and adds a script to move the robot for doing a square.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.
Provide instructions so we can reproduce. Also list any relevant details for your test configuration.

# Step 1a: Run the real robot
roslaunch ca_bringup complete.launch
# Step 1a: Run the simulation
roslaunch ca_gazebo create_empty_world.launch
# Step 2: Run the node
rosrun ca_node move_square.py

Test Configuration:

• Real robot
• Gazebo simulation
• Other (please specify)

Checklist:

• My code follows the style guidelines of this project (Travis CI is passing)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes