Add logarithm of probability for discrete distributions
Add logDensity to exponenetial distribution
Avoid pattern match failure on NaN in cumulative
Add log-density to F-distribution
Add logDensity to normal distribution
Add logDensity to LinearTransform
Add logDensity to StudentT distribution
Add logProbability to geometric distribution
Add logProbability to Poisson distribution
Add logDensity for gamma distr.
Add another variant of geometric distribution
Add instance for generation random numbers for geometric distr.
Add tests for probability in log domain
Changelog and version bump
Move changelog to fie ChangeLog

hackage2 finally supports changleogswq
Remove space
Bump version and fix changelog
Fixed error in standard log density

The standard distribution had an error where the log density was not the same as the log density created 'normDistr 0.0 1.0'. The standard distribution constructor was wrong.
Bump version and update changelog
Use more clever algorithm for automatical choice of histogram range

Fixes #57