add more docker images

circle.yml

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+machine:
+  services:
+    - docker
+
+dependencies:
+  override:
+    - docker info
+    - docker build --rm=false -t TerribleDev/Fortran:4.8-trusty ubuntu/trusty/4.8
+    - docker build --rm=false -t TerribleDev/Fortran:4.7-trusty ubuntu/trusty/4.7
+    - docker build --rm=false -t TerribleDev/Fortran:4.6-trusty ubuntu/trusty/4.6
+    - docker build --rm=false -t TerribleDev/Fortran:4.4-trusty ubuntu/trusty/4.4
+
+deployment:
+  hub:
+    branch: master
+    commands:
+      - docker login -e $DOCKER_EMAIL -u $DOCKER_USER -p $DOCKER_PASS
+      - docker push TerribleDev/Fortran:4.8-trusty
+      - docker push TerribleDev/Fortran:4.7-trusty
+      - docker push TerribleDev/Fortran:4.6-trusty
+      - docker push TerribleDev/Fortran:4.4-trusty

ubuntu/trusty/4.4/Dockerfile

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+FROM ubuntu:trusty
+MAINTAINER "tommy@terribledev.io"
+RUN apt-get update
+RUN apt-get install -y gfortran-4.8
+

ubuntu/trusty/4.6/Dockerfile

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+FROM ubuntu:trusty
+MAINTAINER "tommy@terribledev.io"
+RUN apt-get update
+RUN apt-get install -y gfortran-4.8
+

ubuntu/trusty/4.7/Dockerfile

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+FROM ubuntu:trusty
+MAINTAINER "tommy@terribledev.io"
+RUN apt-get update
+RUN apt-get install -y gfortran-4.7
+