Catkin

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* skip gtest install rules for newer gtest versions (`857 <https://github.com/ros/catkin/issues/857>`_)

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* update --pkg help for catkin_make_isolated (`853 <https://github.com/ros/catkin/issues/853>`_)
* add skipped / disabled tests to catkin_test_results summary (`848 <https://github.com/ros/catkin/issues/848>`_)
* use functions instead of macros where possible to avoid leaking variables (`835 <https://github.com/ros/catkin/issues/835>`_)
* write output of parsing package xml as UTF-8 for Python 3 (`828 <https://github.com/ros/catkin/issues/828>`_)
* update documentation

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* fix regression in logic to select make / ninja for CMake packages from 0.7.2 (`826 <https://github.com/ros/catkin/issues/826>`_)

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* relax fixed DEPENDS check from last release (`825 <https://github.com/ros/catkin/issues/825>`_)

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* change warning to status when nosetests was not found (`823 <https://github.com/ros/catkin/issues/823>`_)
* maintain file context when invoking Python scripts through relay (`820 <https://github.com/ros/catkin/issues/820>`_)
* fix rollback logic for more than one value per environment variable and workspace (`819 <https://github.com/ros/catkin/issues/819>`_)
* add option to use NMake instead of Make (`816 <https://github.com/ros/catkin/pull/816>`_)
* fix check if DEPENDS was found (`813 <https://github.com/ros/catkin/issues/813>`_)
* fix quoting of paths to handle spaces (`808 <https://github.com/ros/catkin/issues/808>`_)
* update doc of catkin_package to clarify importance of case for variable names
* improve doc about catkin_package(CFG_EXTRAS) (`805 <https://github.com/ros/catkin/issues/805>`_)
* doc: fix format 2 howto to suggest to declare a build export dependency on "message_runtime"

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* expose format 2 style dependencies as CMake variables (`787 <https://github.com/ros/catkin/issues/787>`_)