Build Ubuntu 16.04 (Xenial) package in Travis
diff --git a/.travis/xenial/Dockerfile b/.travis/xenial/Dockerfile
new file mode 100644
index 0000000..ad5414f
--- /dev/null
+++ b/.travis/xenial/Dockerfile
@@ -0,0 +1,11 @@
+FROM ubuntu:xenial
+
+RUN apt-get update
+RUN apt-get -y install packaging-dev equivs
+
+RUN useradd -s /bin/bash -m deb
+RUN echo >> /etc/sudoers
+RUN echo "deb ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
+
+USER deb
+WORKDIR /home/deb