added parametrized constructor to allow customizing
VS changed ProjectGuid...
using the parametrized version of the SFMLApp constructor
fixed default constructor initialization: now using a delegating constructor (needs v120 compiler)
parameter order changed
using delegated constructor and raw string literals (for help text)
added hint for using the November CTP of VS2012
Merge branch 'master' of github.com:jschmer/MedienInformatik