Fixed an issue with jpgp building

preinstall/jpgp

@@ -9,7 +9,7 @@ if [ ! -e "bin/$jar" ]; then
 	rm -Rf "$jpgp_folder"
 	git clone --branch=master http://github.com/c-geek/jpgp.git "$jpgp_folder"
 	cd "$jpgp_folder"
-	mvn clean install
+	mvn clean package
 	cp -v "target/$jar" "../bin/"
 	cd ../
 	rm -Rf "$jpgp_folder"