Add ftb Ultimate config

Dockerfile

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+FROM java:8-jre
+MAINTAINER Xawirses <xawirses@gmail.com>
+LABEL maintainer="Xawirses <xawirses@gmail.com>"
+
+RUN apt update && apt install -y unzip
+
+ENV MINECRAFT_VERSION 1.4.7
+ENV FTB_ULTIMATE_VERSION 1.1.2
+ENV FTB_ULTIMATE_FILE_NUM 2260291
+ENV FTB_ULTIMATE_JAR ftbserver.jar
+ENV FTB_ULTIMATE_NAME Ultimate-${FTB_ULTIMATE_VERSION}-${MINECRAFT_VERSION}Server
+ENV FTB_ULTIMATE_ZIP ${FTB_ULTIMATE_NAME}.zip
+ENV FTB_ULTIMATE_URL https://www.feed-the-beast.com/projects/ftb-ultimate/files/${FTB_ULTIMATE_FILE_NUM}/download
+
+RUN mkdir /minecraft
+WORKDIR /minecraft
+
+RUN curl --create-dirs -sLo /minecraft/${FTB_ULTIMATE_ZIP} ${FTB_ULTIMATE_URL} && \
+	unzip ${FTB_ULTIMATE_ZIP}
+
+COPY entrypoint.sh /usr/bin/entrypoint.sh
+RUN chmod +x /usr/bin/entrypoint.sh
+
+ENV JAVA_RAM 4G
+ENV JAVA_OPTS -XX:+UseG1GC -Dsun.rmi.dgc.server.gcInterval=2147483646 -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
+
+EXPOSE 25565
+
+ENTRYPOINT ["/usr/bin/entrypoint.sh"]