Add PointAdd, ScalarMult and DoubleScalarMult to edwards25519#19

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olabini wants to merge 4 commits intoagl:masterfrom olabini:master

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Commits on Jul 23, 2016

Add beginnings of code for testing and doing scalar multiplication and point addition - and testing the assumptions I've made
olabini
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Commits on Jul 25, 2016

Commits on Aug 17, 2016

Change imports
olabini
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