Build tools for rosjava and android repositories. Currently only includes tools for the rosjava repositories which are quite trivial, just a cmake macro. The android repository support has been done, but waiting to see how the android gradle plugin goes before dropping them back in here.

> mkdir -p ~/rosjava/src
> cd ~/rosjava/src
> catkin_init_workspace .
> wstool init .
> wstool set rosjava_tools --git https://github.com/ros-java/rosjava_tools -v hydro-devel
> wstool set rosjava_core --git https://github.com/stonier/rosjava_core -v catkin_tools
> wstool update
> cd ~/rosjava
> catkin_make

The only changes made to the rosjava_core repo was to add a package.xml with a depends on rosjava_tools and a changes to the CMakeLists.txt as follows:

...
find_package(catkin REQUIRED rosjava_tools)

catkin_rosjava_setup(install)

This cmake makro sets up dummy targets in the cmake configuration which call out to gradle in the actual make step. It also parses the package.xml to add target dependencies from each build_depends tag (subsequently letting you sequence builds across repositories).

It also adds a global and package gradle-clean target.

> catkin_make
# Clean a single gradle package
> cd ~/rosjava/build/rosjava_core
> make gradle-clean-rosjava_core
# Clean all gradle packages
> cd ~/rosjava/build
> make gradle-clean