add singularity and docker files for macs2

src/docker_modules/macs2/2.1.0/Dockerfile

-FROM ubuntu:18.04
-MAINTAINER Laurent Modolo
-
-ENV MACS_VERSION=2.1.1.20160309
-ENV PACKAGES git=1:2.17* \
-   build-essential=12.4* \
-   python-pip=9.0.1* \
-   ca-certificates=20180409 \
-   python-setuptools=39.0.1* \
-   python-dev=2.7* \
-   python-numpy=1:1.13* \
-   python-wheel=0.30.0* \
-   zlib1g-dev=1:1.2.11*
-
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends ${PACKAGES} && \
-    apt-get clean
-
-RUN pip install MACS2==${MACS_VERSION}
-

src/docker_modules/macs2/2.1.0/docker_init.sh

-#!/bin/sh
-docker build src/docker_modules/macs2/2.1.0 -t 'macs2:2.1.0'

src/docker_modules/macs2/2.1.2/Dockerfile

+FROM quay.io/biocontainers/macs2:2.1.2--py27r351h14c3975_1
+MAINTAINER Laurent Modolo

src/docker_modules/macs2/2.1.2/docker_init.sh

+#!/bin/sh
+docker build src/docker_modules/macs2/2.1.2 -t 'macs2:2.1.2'

src/singularity_modules/macs2/2.1.0/build.sh

-#/bin/sh
-sudo singularity build --force bin/bowtie:1.2.2.sif src/singularity_modules/bowtie/1.2.2/bowtie.def && \
-singularity sign bin/bowtie:1.2.2.sif

src/singularity_modules/macs2/2.1.2/build.sh

+#/bin/sh
+sudo singularity build --force bin/macs2:2.1.1--py27r351h14c3975_1.sif docker://quay.io/biocontainers/macs2:2.1.2--py27r351h14c3975_1 && \
+singularity sign bin/macs2:2.1.1--py27r351h14c3975_1.sif