fix(beta-distribution): handle boundary points in pdf correctly#169
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The pdf method returned 0 for x=0 and x=1 unconditionally. When alpha < 1 the density diverges to +∞ at x=0, and similarly for beta < 1 at x=1. When alpha=1 or beta=1 the boundary value is finite (1/B(α,β)). The interior formula cannot handle these points because (α-1)·log(0) is 0·(−∞) = NaN in IEEE 754. Fixes #165
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The pdf method returned 0 for x=0 and x=1 unconditionally. When alpha < 1 the density diverges to +∞ at x=0, and similarly for beta < 1 at x=1. When alpha=1 or beta=1 the boundary value is finite (1/B(α,β)). The interior formula cannot handle these points because (α-1)·log(0) is 0·(−∞) = NaN in IEEE 754.
Fixes #165