added config file (e.g. COM port)
return error if there is no arduino connected
better error messages for arduino connection
small refactoring and documentation
more refactoring of the question package
increased dbapi timeout
more refactoring of questions package, created utility package
finished refactoring and documentation for re:publica presentation.
Merge pull request #2 from FraBle/develop

Refactoring and documentation of code before presentation at re:publica.