add tor browser support

.docker/files/tor-browser/Dockerfile

@@ -0,0 +1,28 @@
+FROM nurdism/neko:openbox
+
+#
+# install dependencies
+RUN set -eux; apt-get update; \
+    apt-get install -y --no-install-recommends curl xz-utils file libgtk-3-0 libdbus-glib-1-2; \
+    #
+    # clean up
+    apt-get clean -y; \
+    rm -rf /var/lib/apt/lists/* /var/cache/apt/*
+
+WORKDIR /home/neko
+USER neko
+
+#
+# download TOR browser
+RUN DOWNLOAD_URI="$(curl -s -N https://www.torproject.org/download/ | grep -Po -m 1 '(?=(dist/torbrowser)).*(?<=.tar.xz)')"; \
+	echo "Downloading $DOWNLOAD_URI"; \
+	curl -sSL -o tor.tar.xz "https://www.torproject.org/$DOWNLOAD_URI"; \
+    tar -xvJf tor.tar.xz; \
+    rm -f tor.tar.xz*;
+
+USER root
+
+#
+# copy configuation file
+COPY .docker/files/tor-browser/supervisord.conf /etc/neko/supervisord/tor-browser.conf
+COPY .docker/files/tor-browser/openbox.xml /etc/neko/openbox.xml