Implement several traits from num_traits for NotNaN
#31
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This addresses #16.
The trait
Floatis deliberately not implemented forNotNaNbecause of the required methodsnanandis_nan. Unfortunately, this makes many of the useful methods fromFloatunavailable forNotNaN, but as long as aFloatis required to support a NaN-value I do not see a way around it. (Maybe it would be a good idea fornumto splitFloatinto two traits,RealandNaN, and thentrait Float: Real + NaN, but this discussion should probably go tonumitself).