Adding Mode, Kurtosis and Skewness measures to CircularDescriptiveAnalysis;
Updating CircularDescriptiveMeasure and DescriptiveMeasure to implement a common interface.
Working on documentation, small improvements for .NET 4.5.
Updating Logistic Regression and Proportional Hazards to avoid computing the LR-ratio tests unless necessary using lazy evaluation.
Adding Red-Black trees.
Adding the Lévy and Folded Normal distributions.
Creating a dedicated Accord.Collections namespace to accommodate common structures used inside the framework (this might be revised)
Working on documentation.
Adding a Red-Black dictionary based on Red-Black trees with support for efficiently searching maximum and minimum elements.
Fixing random setup function on .NET 4.5.
Additional (still failing) tests for red-black trees and dictionary.
Missing changes and small corrections for the statistics namespace.
Adding first versions of the Nelder-Mead and Subplex optimization algorithms.
Correcting the Lévy distribution.
Fixing red-black tree tests; adding support for enabling or disabling duplicates in the trees.
Avoiding exposing previously internal types which should be available in newer .NET Framework versions.
Small refactoring/renaming changes.
Merge remote-tracking branch 'upstream/development' into development
Project cleanups
Merge branch 'development' into portable

Conflicts:
	Sources/Accord.Core/Accord.Core.csproj
	Sources/Accord.Math/Accord.Math.csproj
	Unit Tests/Accord.Tests.Math/Accord.Tests.Math.csproj
Updated portable projects to latest development commit