RiskMetrics written and tested
QtMath include header changed to QtCore/qtmath.h for travis
QtMath include header changed to QtCore/qtmath.h for travis in MathFunctions.h
.pro files indentations corrected
Slight optimization for VaR computation
Merge conflicts from script-correlation-r fixed
Merged with master
Merge branch 'var-riskmetrics' of https://github.com/pchaigno/ProjetVaR into var-riskmetrics
Historical VaR made positive, only positive returns scenario added
excute date parameter behaviour corrected
First dates case managed, tests and comments added
Backtesting and Portfolio:retrieveReturnHorizon methods written
Completed comment in VaRHistorical::execute()
Merge pull request #53 from pchaigno/var-historic-patch

Var historic patch
retrieveReturnHorizon tests
Merge branch 'master' into backtesting
Backtesting test added
Merge branch 'master' into var-riskmetrics
VaRAlgorithm::checkDate() written
Lambda parameter made constant, Licence text added to MathFunctions.cpp, VaRRiskmetrics::execute() code slipt and commented