Make all extensions public so they're accessible via frameworks #16
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This commit addresses issue #15, "Make extensions public."
All extensions are made public, so they can be referenced when
VectorMath is added to a project as a framework via Cocoapods.
Extensions that declare conformance to Hashable are broken out as
separate extensions, because extensions that declare protocol
conformance cannot be declared public.
The explicit definition of Scalar.pi is removed, because Swift
already declares it as Float.pi and Double.pi. When VectorMath is
added to a project as a framework and Scalar.pi is referenced, the
duplicate definition of pi causes a compiler error about ambiguous
symbols.