Update dependencies and fix build server issues

.buildrc

@@ -0,0 +1,10 @@
+export BUILD_DATE=$(TZ=UTC date "+%Y-%m-%d")
+export BUILD_TIME=$(TZ=UTC date "+%H:%M:%S %Z")
+
+npm install
+bundle install
+
+sed -i "s/^     date:.*$/     date: $BUILD_DATE/" _config.yml
+sed -i "s/^     time:.*$/     time: $BUILD_TIME/" _config.yml
+
+JEKYLL_ENV=production bundle exec jekyll build