Lipyphilic

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* PR54 Fixed typos in docs
* PR53 Improved performance of lipyphilic.analysis.flip_flop.FlipFlop
* PR52 Improved performance of lipyphilic.analysis.neighbours.Neighbours (Fixes 51)

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* PR49 Add min_diff argument to transformations.center_membrane
* PR48 Add MDAnalysis badge to README and fix typos in the docs
* PR47 Fixed typos in docs

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* PR44 Refactor the Registration analysis to have a more useful API
* PR43 Add a method for calculating the lipid enrichment/depletion index
* PR42 Add a MSD and lateral diffusion analysis, as well as a transformation to perform "nojump" unwrapping.
* PR39 Add support for assigning lipids to leaflets of highly curved membranes

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* PR38 Add a trajectory transformation for unwrapping broken membranes (Fixes 37)
* PR36 Add method for projecting areas onto the membrane plane (Fixes 33)
* PR35 Added a tool for calculating membrane thickness (Fixes 34)
* PR32 ZThickness.average() now returns a new ZThickness object rather than a NumPy array
* PR31 SCC.weighted_average() now returns a new SCC object rather than a NumPy array
* PR30 Add class for plotting projections of membrane properties onto the xy plane.
* PR29 Added plotting of joint probability distributions or PMFs (Fixed 28).

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* PR26 Added a tool to calculate the thickness of lipids or their tails (Fixes 25)
* PR24 Added a tool to calculate the coarse-grained order parameter (Fixes 23)
* PR22 Added a tool to calculate orientation of lipids in a bilayer (Fixes 20)
* PR21 Added a tool to calculate lipid height in a bilayer (Fixes 19)
* Better description of analysis tools in the docs
* Updated installation instructions, including installing via conda-forge

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* Fix typo in requirements