OSX/Homebrew: Use homebrew maintained mongodb

 - Change from our mongodb-dev to homebrew maintained mongodb
 - homebrew maintained mongodb builds and installs libs since https://github.com/Homebrew/homebrew/pull/25253
 - --with-boost option is needed, so depends on https://github.com/ros-infrastructure/rosdep/pull/304

Is there a way to list all released pacakges depending on the `mongodb-dev` rosdep key?