Cabal file upgraded to GHC 7.6.3 (for #19)
Copula documentation
Initial refactoring of volatility estimators to fit needs of devs
for #20 and close #17
Minor documentations for #17
Merge branch 'feature/volestimators' into develop
close #20 and #17
Merge branch 'release/0.0.2.4'
close #17, #20