Update mysql2 gem.
Update mysql2 gem.

DrTom/fulcrum,Aupajo/fulcrum,PedroFelipe/cm42-central,HenryYan2012/fulcrum,jimbeaudoin/agile-tracker,HenryYan2012/fulcrum,jimbeaudoin/agile-tracker,KentFujii/fulcrum,fulcrum-agile/fulcrum,DrTom/fulcrum,privatt/privatt-agile-tracker,fulcrum-agile/fulcrum,Codeminer42/cm42-central,Codeminer42/cm42-central,fulcrum-agile/fulcrum,nh-platform/demo-fulcrum,PedroFelipe/cm42-central,privatt/privatt-agile-tracker,PedroFelipe/cm42-central,ipmobiletech/fulcrum,nh-platform/demo-fulcrum,ipmobiletech/fulcrum,Aupajo/fulcrum,DrTom/fulcrum,Codeminer42/cm42-central,privatt/privatt-agile-tracker,ipmobiletech/fulcrum,jimbeaudoin/agile-tracker,HenryYan2012/fulcrum,KentFujii/fulcrum,nh-platform/demo-fulcrum,Aupajo/fulcrum,KentFujii/fulcrum