Commits on May 3, 2018

1. Don't mutate the elliptic curve prototype with get* additions …

   Point's prototype is set to the prototype of ec('secp256k1').curve.point(), which means mutation to it is shared across users of 'elliptic' via the in-memory representation of those objects.
   
   This is not generally a problem, for example, with `validate` it's a simple set, so the greatest risk is that it will be directly overwritten.
   
   But in the case of `getX` and `getY`, both methods are overwritten with others that depend on the prior implementation as stored in `_get*`. If this happens twice, then the implementation of `_getX` is replaced with something that depends on a call to `_getX`, and the callers is stuck in an infinite loop.

   

   Empact committed May 3, 2018
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