unify discrete sampler testing
automatically determine the range of values in test_samples
remove verbose
test continuous samplers using new tools
remove old test files for samplers
use color in test logs
add generic test functions for testing discrete univariate distributions
remove old test/discrete.jl
Merge commit '46990029bc4b12a2d6b3b89f578cd6831e3c1515' into dh/rtests
further improved display
add maximum, minimum, islowerbounded, isupperbounded for Truncated
refactoring testing utilities
test evaluation for continuous univariate distributions
test sampling for Univariate distributions
use more samples in testing
fix the entropy method for Frechet distribution
tested univariate distributions using new tools
remove spurious import from Calculus
add test/discrete.jl
add discrete.jl to runtests