Update pamflet-plugin to the actual version 0.4.1

Update pamflet-plugin to the actual version **0.4.1**, because the version 0.3.0 of the pamflet-library_2.9.2 is not available via maven central.

See: 
http://repo1.maven.org/maven2/net/databinder/pamflet-library_2.9.2/
and 
http://repo1.maven.org/maven2/net/databinder/pamflet-library_2.9.1/