[R-Help] Updated servlet version spec to be in sync with jetty

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>
[R-Help] Added dependency on jetty, maybe it will fix problems when
different servlet versions are installed

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>
[Rt-GGPlot] Fixed wrong code generation for 'axis.title.y' style properties

(reported by Tobias Verbeke)

Signed-off-by: Stephan Wahlbrink <sw@wahlbrink.eu>