@QueryParam expects a default value

@QueryParam now expects also a default value for the parameter
Usage of @DefaultValue Annotation is still possible (for parameters not
covered by the REST API)
LAS-15 Support HTTP-Headers & Status

Added support for HTTP headers as input:
@HeaderParam is used like @QueryParam to map header values to parameters

@HttpHeaders maps all headers as a string to a variable

Services can use HttpResponse as a return value.
HttpResponse allows to set response headers, HTTP-Status and the return
value of the method.