added debian-7 and ubuntu-14.04

debian-7/Dockerfile

@@ -0,0 +1,15 @@
+FROM debian:7
+
+RUN apt-get -q update \
+    && apt-get -yq install --no-install-recommends \
+      build-essential \
+      libffi-dev \
+      libssl-dev \
+      python \
+      python-dev \
+      python-pip \
+    && apt-get clean \
+    && pip install --quiet --upgrade setuptools \
+    && pip install --quiet --upgrade ansible
+
+CMD ["ansible-playbook", "--help"]

ubuntu-14.04/Dockerfile

@@ -0,0 +1,12 @@
+FROM ubuntu:14.04
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+      software-properties-common \
+    && apt-add-repository ppa:ansible/ansible \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+      ansible \
+    && apt-get clean
+
+CMD ["ansible-playbook", "--help"]