Added unwrap and wrap transformations#2020

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davidercruz wants to merge 22 commits intoMDAnalysis:developfrom

davidercruz:pbc

Commits on Jul 21, 2018

fixed issue with rotation from non-origin point calculation
davidercruz
committed
rotaateby now behaves as rotate, updated tests to use transform(matrix)
davidercruz
committed

Commits on Jul 28, 2018

Improved docs; test point and vector in 2 shapes
davidercruz
committed

Commits on Aug 1, 2018

added wrap and unwrap
davidercruz
committed

Commits on Aug 3, 2018

Commits on Aug 4, 2018

removed use of pytest.approx (#2019)
richardjgowers
authored