Taylor Series

Taylor Series Expansion for fast compute trigonometry and other math
functions.
Dissimilarity

Dissimilarity metrics.
Greatest common divisor

gcd method
GH-31: Add new HMM methods to compute the probability of an state inside an observation sequence.
Also adding better error checking and exception handling, and updating unit tests. Resolves GC-103.
Merge pull request #37 from DiegoCatalano/development

Merging pull request from Diego Catalano: Adding support for computing various functions through Taylor series, adding support for dissimilarity functions and extra mathematical utility functions.
Merge remote-tracking branch 'upstream/development' into development