Revert "update to ubuntu 16.04"

This reverts commit 9a353a9.

Dockerfile

@@ -1,14 +1,14 @@
-FROM ubuntu:16.04
+FROM ubuntu:14.04
 
-LABEL ubuntu.version="16.04" bowtie2.version="2.1.0-2" cufflinks.version="2.1.1-4" cummerbund.version="2.4.1-1" R.version="3.0.2" samtools.version="0.1.19-1" tophat.version="2.0.9-1ubuntu1" 
+LABEL ubuntu.version="14.04" bowtie2.version="2.1.0-2" cufflinks.version="2.1.1-4" cummerbund.version="2.4.1-1" R.version="3.0.2" samtools.version="0.1.19-1" tophat.version="2.0.9-1ubuntu1" 
 
 ARG DEBIAN_FRONTEND=noninteractive
 
 ADD https://raw.githubusercontent.com/cyverseuk/tuxedo/master/cummerbund_plot_scripts.r /usr/local/bin/
 
 ADD https://raw.githubusercontent.com/cyverseuk/tuxedo/master/rna_seq_4_conditions_docker.py /usr/local/bin/
 
-RUN echo "deb http://archive.ubuntu.com/ubuntu/ xenial multiverse" >> /etc/apt/sources.list && \
+RUN echo "deb http://archive.ubuntu.com/ubuntu/ trusty multiverse" >> /etc/apt/sources.list && \
 	apt-get update -y && apt-get -yy install bowtie2 software-properties-common samtools tophat cufflinks r-base r-bioc-cummerbund && \
 	chmod +x /usr/local/bin/rna_seq_4_conditions_docker.py && \
     	chmod +x /usr/local/bin/cummerbund_plot_scripts.r