Today, the ROS Community Build Tool Team has released the second catkin_tools beta, Version 0.4.0!

Previously, a quick summary:
- `catkin_tools` is an improved toolchain for building catkin workspaces
- the CLI command is `catkin build`
- it builds packages in parallel with isolated build directories (no CMake crosstalk)
- it builds "pure" CMake packages that don't use Catkin macros
- it lets you build subsets of a workspace
- it needs to be tested more before being recommended over `catkin_make`
- the documentation for all the additional features can be found here: http://catkin-tools.readthedocs.org/

The top five reasons you'll want to try Beta 2:
1. The ability to reliably clean parts of your workspace without rebuilding everything!
2. A new warning and error display!
3. New ways to quickly move to and source a workspace!
4. A new asynchronous execution model for building and cleaning!
5. 26 crushed outstanding bugs!

Either install it with pip:
pip install catkin_tools --upgrade

or install via apt-get with:
apt-get update
apt-get install python-catkin-tools

To check the version of catkin_tools you're using, run:
catkin --version

If you've installed the second beta (0.4.0), you should see:
catkin_tools 0.4.0 (C) 2014-2016 Open Source Robotics Foundation

For those new to catkin_tools, see the migration guide:
Migrate from catkin_make!

Any issues, questions, or feature requests should be posted on GitHub:
Submit an issue!

Thanks!
-The ROS Community Build Tool Team