DescriptorService: Initial commit

Added DefaultDescriptorService and ResolveDescriptor.
DescriptorServiceTest: Added few functionality tests for DescriptorService
CenterOfGravity: Interface + Implementations added
Circularity: Interface + Implementations added
Eccentricity: Interface + Implementations added
Perimeter: Interface + Implementations added
Area: Interface + Implementations added
Feret: Interface + Implementations added
ExtractContourViaBitMask: Initial commit.
Mean: Several interfaces and implementations added
Median/Percentile: Interface and implementations
Min/Max: Interfaces and implementations
Sums: Interfaces and implementations
StdDev: Interfaces and implementations
Moments: Interfaces and implementations
Kurtosis: Interfaces and implementations
Variance: Interfaces and implementations
Refactored Histgram to CreateHistogram
Removed old statistics package
Removed rest of statistics package