Py-trees

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* [blackboard] bugfix metadata not created on static set, `286 <https://github.com/splintered-reality/py_trees/pull/286>`_

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* [composites] parallel bugfix to invalidate correctly, `285 <https://github.com/splintered-reality/py_trees/pull/285>`_

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* [idioms] the either_or pattern, designed to replace the Chooser, `283 <https://github.com/splintered-reality/py_trees/pull/283>`_
* [behaviours] TickCounter, a timer based on tree ticks, `283 <https://github.com/splintered-reality/py_trees/pull/283>`_
* [behaviours] CheckBlackboardVariableValues, logical checks across multiple values, `283 <https://github.com/splintered-reality/py_trees/pull/283>`_
* [common] ComparisonExpression, a more concise way of storing checkers, `283 <https://github.com/splintered-reality/py_trees/pull/283>`_
* [composites] protect against adding a child to multiple parents, `281 <https://github.com/splintered-reality/py_trees/pull/281>`_

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* [display] completely remove blackboard variables from the dot layout, `280 <https://github.com/splintered-reality/py_trees/pull/280>`_

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* [trees] setup timeout error with last behaviour name included in the error message, `279 <https://github.com/splintered-reality/py_trees/pull/279>`_
* [blackboard] rooted variables in namespaced clients working as designed, fixed docs, `277 <https://github.com/splintered-reality/py_trees/pull/277>`_

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* [demos] display modes demonstrating usage of various options, `275 <https://github.com/splintered-reality/py_trees/pull/275>`_
* [display] enforce left to right ordering of children in dot graphs