GH-25: SauvolaThreshold and NiblackThreshold filter are always making whole black image.
Fix bernoulli distribution sampling, and add test

Previous version was almost always sampling 1
Merge pull request #27 from david-durrleman/development

GH-27: Fixing bernoulli distribution sampling
Working on the integration algorithms.
Correcting Mode calculation on statistic distributions, adding General Continuous Distribution with automatic measures computation.
Starting to unify feature matching algorithms under a common interface.
Adding inner and outer fences calculation in Descriptive Analysis.
Minor updates.
Merge branch 'development' of https://github.com/accord-net/framework into development
Adding unit tests and working in documentation for TukeyLambdaDistribution;
Adding LogisticDistribution.
Adding the HyperbolicSecant and Degenerate distributions; working on documentation.
GC-98: ProbabilityDensityFunction in MultivariateNormalDistribution does not return values higher than 1.
Working on documentation.
GC-99: Result of Combinatorics.Permutations(array) method does not include the original array.
Updating release notes.
Merge remote-tracking branch 'upstream/development' into development