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With the release version the robot is not moving because there is a conflict with the cmd_vel topic name. The navigation publishes the twist command to /base_controller/command and gazebo is subscribed to /base/twist_controller/command.

The problem is already fixed but, at the moment, you have to use the actual source version. You can create a cob3-2_navigation.rosinstall file with the following lines:

 - git:
    uri: 'https://github.com/ipa320/cob_common.git'
    local-name: cob_common
    version: indigo_dev
- git:
    uri: 'https://github.com/ipa320/cob_control.git'
    local-name: cob_control
    version: indigo_dev
- git:
    uri: 'https://github.com/ipa320/cob_driver.git'
    local-name: cob_driver
    version: indigo_dev
- git:
    uri: 'https://github.com/ipa320/cob_robots.git'
    local-name: cob_robots
    version: indigo_dev
- git:
    uri: 'https://github.com/ipa320/cob_navigation.git'
    local-name: cob_navigation
    version: indigo_dev

And install the necessary packages using the commands:

rosinstall ~/YourWorkSpace/src cob3-2_navigation.rosinstall
rosdep install --from-path ~/YourWorkSpace/src -i -y
source ~/YourWorkSpace/devel/setup