Jacobi elliptic functions and complete elliptic integral of the first kind#79

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ettersi wants to merge 18 commits intoJuliaMath:masterfrom

ettersi:pull-request/de7d83b2

Commits on Mar 1, 2018

Add ellipj implementation
Simon Etter
committed

Commits on Mar 3, 2018

Pre-cleanup
Simon Etter
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Post cleanup
Simon Etter
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Finish Jacobi elliptic functions
Simon Etter
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Add jpq functions
Simon Etter
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Include in SpecialFunctions and add tests
Simon Etter
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Commits on Mar 5, 2018

Update
Simon Etter
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Update documentation
Simon Etter
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Fix 0.7 deprecations and erros.
Simon Etter
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Fix test error on 32bit systems (fingers crossed)
Simon Etter
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Factor trigonometric and hyperbolic functions into variables
Simon Etter
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Align equations
Simon Etter
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Add references to DLMF
Simon Etter
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Commits on Mar 6, 2018

Make sure `nsteps` gets called only once even for `BigFloat`s.
Simon Etter
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Remove some @generated.
Simon Etter
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Optimise evaluation of tanh(u) and sech(u)
Simon Etter
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Rename (i)K -> ellip(i)K
Simon Etter
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Commits on Mar 20, 2018

Fix `puresqrt()`
Simon Etter
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