umitools: add docker and singularity files

src/singularity_modules/umitools/0.3.4/build.sh

+#/bin/sh
+sudo singularity build --force bin/umitools:0.3.4.sif docker://quay.io/biocontainers/umitools:0.3.4--py37_1 && \
+singularity sign bin/umitools:0.3.4.sif

src/singularity_modules/umitools/0.3.4/umitools.def

+Bootstrap: docker
+From: ubuntu:18.04
+%labels
+MAINTAINER Laurent Modolo
+%post
+
+UMITOOLS_VERSION=0.3.4
+PACKAGES="git \
+build-essential \
+python-pip \
+ca-certificates \
+python-setuptools \
+python-dev \
+python-numpy \
+python-wheel \
+zlib1g-dev"
+
+apt-get update && \
+apt-get install -y --no-install-recommends ${PACKAGES} && \
+apt-get clean
+
+pip install umitools==${UMITOOLS_VERSION}
+
+%environment
+export UMITOOLS_VERSION=0.3.4
+
+%runscript
+exec /bin/bash "$@"