Add slim variants

[tianon]

Fixes #16

[tianon]

diff --git a/2.7/Dockerfile b/2.7/slim/Dockerfile
index d71d25b..71a27de 100644
--- a/2.7/Dockerfile
+++ b/2.7/slim/Dockerfile
@@ -1,4 +1,4 @@
-FROM buildpack-deps:jessie
+FROM debian:jessie

 # remove several traces of debian python
 RUN apt-get purge -y python.*
@@ -7,9 +7,13 @@ RUN apt-get purge -y python.*
 # > At the moment, setting "LANG=C" on a Linux system *fundamentally breaks Python 3*, and that's not OK.
 ENV LANG C.UTF-8

+RUN apt-get update && apt-get install -y ca-certificates libssl1.0.0 --no-install-recommends && rm -rf /var/lib/apt/lists/*
+
 ENV PYTHON_VERSION 2.7.8

 RUN set -x \
+   && buildDeps='curl gcc libc6-dev libssl-dev make xz-utils zlib1g-dev' \
+   && apt-get update && apt-get install -y $buildDeps --no-install-recommends && rm -rf /var/lib/apt/lists/* \
    && mkdir -p /usr/src/python \
    && curl -SL "https://www.python.org/ftp/python/$PYTHON_VERSION/Python-$PYTHON_VERSION.tar.xz" \
        | tar -xJC /usr/src/python --strip-components=1 \
@@ -23,6 +27,7 @@ RUN set -x \
        \( -type d -a -name test -o -name tests \) \
        -o \( -type f -a -name '*.pyc' -o -name '*.pyo' \) \
        -exec rm -rf '{}' + \
+   && apt-get purge -y --auto-remove $buildDeps \
    && rm -rf /usr/src/python

 # install "virtualenv", since the vast majority of users of this image will want it

diff --git a/3.3/Dockerfile b/3.3/slim/Dockerfile
index 77e8c42..6b45021 100644
--- a/3.3/Dockerfile
+++ b/3.3/slim/Dockerfile
@@ -1,4 +1,4 @@
-FROM buildpack-deps:jessie
+FROM debian:jessie

 # remove several traces of debian python
 RUN apt-get purge -y python.*
@@ -7,9 +7,13 @@ RUN apt-get purge -y python.*
 # > At the moment, setting "LANG=C" on a Linux system *fundamentally breaks Python 3*, and that's not OK.
 ENV LANG C.UTF-8

+RUN apt-get update && apt-get install -y ca-certificates libssl1.0.0 --no-install-recommends && rm -rf /var/lib/apt/lists/*
+
 ENV PYTHON_VERSION 3.3.6

 RUN set -x \
+   && buildDeps='curl gcc libc6-dev libssl-dev make xz-utils zlib1g-dev' \
+   && apt-get update && apt-get install -y $buildDeps --no-install-recommends && rm -rf /var/lib/apt/lists/* \
    && mkdir -p /usr/src/python \
    && curl -SL "https://www.python.org/ftp/python/$PYTHON_VERSION/Python-$PYTHON_VERSION.tar.xz" \
        | tar -xJC /usr/src/python --strip-components=1 \
@@ -23,6 +27,7 @@ RUN set -x \
        \( -type d -a -name test -o -name tests \) \
        -o \( -type f -a -name '*.pyc' -o -name '*.pyo' \) \
        -exec rm -rf '{}' + \
+   && apt-get purge -y --auto-remove $buildDeps \
    && rm -rf /usr/src/python

 # make some useful symlinks that are expected to exist

diff --git a/3.4/Dockerfile b/3.4/slim/Dockerfile
index f9a4560..4fd7462 100644
--- a/3.4/Dockerfile
+++ b/3.4/slim/Dockerfile
@@ -1,4 +1,4 @@
-FROM buildpack-deps:jessie
+FROM debian:jessie

 # remove several traces of debian python
 RUN apt-get purge -y python.*
@@ -7,9 +7,13 @@ RUN apt-get purge -y python.*
 # > At the moment, setting "LANG=C" on a Linux system *fundamentally breaks Python 3*, and that's not OK.
 ENV LANG C.UTF-8

+RUN apt-get update && apt-get install -y ca-certificates libssl1.0.0 --no-install-recommends && rm -rf /var/lib/apt/lists/*
+
 ENV PYTHON_VERSION 3.4.2

 RUN set -x \
+   && buildDeps='curl gcc libc6-dev libssl-dev make xz-utils zlib1g-dev' \
+   && apt-get update && apt-get install -y $buildDeps --no-install-recommends && rm -rf /var/lib/apt/lists/* \
    && mkdir -p /usr/src/python \
    && curl -SL "https://www.python.org/ftp/python/$PYTHON_VERSION/Python-$PYTHON_VERSION.tar.xz" \
        | tar -xJC /usr/src/python --strip-components=1 \
@@ -22,6 +26,7 @@ RUN set -x \
        \( -type d -a -name test -o -name tests \) \
        -o \( -type f -a -name '*.pyc' -o -name '*.pyo' \) \
        -exec rm -rf '{}' + \
+   && apt-get purge -y --auto-remove $buildDeps \
    && rm -rf /usr/src/python

 # make some useful symlinks that are expected to exist

[yosifkit]

LGTM