Catkin

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* remove CPATH from setup files (`783 <https://github.com/ros/catkin/issues/783>`_)
* use NO_MODULE to find exported catkin dependencies (`760 <https://github.com/ros/catkin/issues/760>`_)

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* fix docs: nosetest target names use periods (`781 <https://github.com/ros/catkin/issues/781>`_)
* add custom message explaining CMake find_package error messages (`780 <https://github.com/ros/catkin/issues/780>`_)
* fix regression with DESTDIR introduced in 0.6.16 (`755 <https://github.com/ros/catkin/issues/755>`_)
* avoid adding nonexistent paths to environment variables (`777 <https://github.com/ros/catkin/issues/777>`_)
* ensure that Python install destination exists (`775 <https://github.com/ros/catkin/issues/775>`_, https://github.com/ros/catkin/issues/776)
* set commonly predefines attributes when interrogating setup.py files (`770 <https://github.com/ros/catkin/issues/770>`_)
* align Python script directory recommendations with REP-0008 (`769 <https://github.com/ros/catkin/issues/769>`_)
* fix default value for _workspaces in find_in_workspaces (`768 <https://github.com/ros/catkin/issues/768>`_)
* improve robustness of exec call interogating setup.py files (`766 <https://github.com/ros/catkin/issues/766>`)
* fix reinstalling Python files installed by catkin_install_python after modifying them (`764 <https://github.com/ros/catkin/issues/764>`_)
* fix project specific clean_test_results targets (`762 <https://github.com/ros/catkin/issues/762>`_)
* update generated CMake API

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* remove -x in Python distutils shell script (`755 <https://github.com/ros/catkin/issues/755>`_)

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* adding check to prevent tool cross talk (`743 <https://github.com/ros/catkin/issues/743>`_)
* only clean the test result ending with .xml of the current project (`737 <https://github.com/ros/catkin/issues/737>`_)
* fix regression in find_in_workspaces (`739 <https://github.com/ros/catkin/issues/739>`_)
* fix setup.py package_dir location logic (`751 <https://github.com/ros/catkin/issues/751>`_)

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* support zsh with NOCLOBBER enabled (`734 <https://github.com/ros/catkin/pull/734>`_)

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* allow setting CATKIN_GLOBAL_LIBEXEC_DESTINATION to libexec (`713 <https://github.com/ros/catkin/pull/713>`_)