Moved initSubsystems from engine start to a separate user/loader call
Merge pull request #22 from Eaglegor/CoreSubsystems

Moved initSubsystems from engine start to a separate user/loader call
Getter of properties returning boost::optional
Merge pull request #23 from Eaglegor/CoreSubsystems

Getter of properties returning boost::optional
Merge branch 'master' of github.com:Eaglegor/UnknownEngine into OgreRenderSubsystem
Parsers