Add python

```console
root@357dc9c62428:/stackbrew/stackbrew# ./brew-cli --debug -b python --targets python git://github.com/infosiftr/stackbrew
2014-06-23 21:35:37,763 DEBUG Cloning repo_url=git://github.com/infosiftr/stackbrew, ref=python
2014-06-23 21:35:37,765 DEBUG folder = /tmp/tmpayx96c
2014-06-23 21:35:37,765 DEBUG Cloning git://github.com/infosiftr/stackbrew into /tmp/tmpayx96c
2014-06-23 21:35:37,765 DEBUG Executing "git clone git://github.com/infosiftr/stackbrew ." in /tmp/tmpayx96c
Cloning into '.'...
remote: Counting objects: 800, done.
remote: Compressing objects: 100% (360/360), done.
remote: Total 800 (delta 435), reused 787 (delta 429)
Receiving objects: 100% (800/800), 120.52 KiB | 0 bytes/s, done.
Resolving deltas: 100% (435/435), done.
Checking connectivity... done.
2014-06-23 21:35:38,591 DEBUG Checkout ref:python in /tmp/tmpayx96c
2014-06-23 21:35:38,591 DEBUG Executing "git checkout python" in /tmp/tmpayx96c
Branch python set up to track remote branch python from origin.
Switched to a new branch 'python'
2014-06-23 21:35:38,597 DEBUG latest: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 3

2014-06-23 21:35:38,597 DEBUG 3.4.1: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 3

2014-06-23 21:35:38,597 DEBUG 3.4: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 3

2014-06-23 21:35:38,597 DEBUG 3: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 3

2014-06-23 21:35:38,597 DEBUG 2.7.7: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 2

2014-06-23 21:35:38,598 DEBUG 2.7: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 2

2014-06-23 21:35:38,598 DEBUG 2: git://github.com/docker-library/docker-python@10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 2

2014-06-23 21:35:38,598 DEBUG python: latest,3.4.1,3.4,3
2014-06-23 21:35:38,598 DEBUG python: 2.7.7,2.7,2
2014-06-23 21:35:38,598 DEBUG Cloning repo_url=git://github.com/docker-library/docker-python, ref=10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362
2014-06-23 21:35:38,598 DEBUG folder = /tmp/tmpbq26Gh
2014-06-23 21:35:38,598 DEBUG Cloning git://github.com/docker-library/docker-python into /tmp/tmpbq26Gh
2014-06-23 21:35:38,598 DEBUG Executing "git clone git://github.com/docker-library/docker-python ." in /tmp/tmpbq26Gh
Cloning into '.'...
remote: Counting objects: 36, done.
remote: Compressing objects: 100% (16/16), done.
remote: Total 36 (delta 8), reused 36 (delta 8)
Receiving objects: 100% (36/36), done.
Resolving deltas: 100% (8/8), done.
Checking connectivity... done.
2014-06-23 21:35:39,044 DEBUG Checkout ref:10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 in /tmp/tmpbq26Gh
2014-06-23 21:35:39,044 DEBUG Executing "git checkout 10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362" in /tmp/tmpbq26Gh
Note: checking out '10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:

  git checkout -b new_branch_name

HEAD is now at 10eb8b1... Put "curl | tar" in a separate RUN since we keep the source around at the end of the build anyways
2014-06-23 21:35:39,048 INFO Build start: python ('git://github.com/docker-library/docker-python', '10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362', '3')
2014-06-23 21:40:22,623 INFO Build success: a331d9b4fb9c (python:latest)
2014-06-23 21:40:22,628 INFO Build success: a331d9b4fb9c (python:3.4.1)
2014-06-23 21:40:22,632 INFO Build success: a331d9b4fb9c (python:3.4)
2014-06-23 21:40:22,636 INFO Build success: a331d9b4fb9c (python:3)
2014-06-23 21:40:22,641 DEBUG Checkout ref:10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362 in /tmp/tmpbq26Gh
2014-06-23 21:40:22,641 DEBUG Executing "git checkout 10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362" in /tmp/tmpbq26Gh
HEAD is now at 10eb8b1... Put "curl | tar" in a separate RUN since we keep the source around at the end of the build anyways
2014-06-23 21:40:22,645 INFO Build start: python ('git://github.com/docker-library/docker-python', '10eb8b1bac2bfbc6d1fdf1dad9c1ecae1d607362', '2')
2014-06-23 21:55:07,422 INFO Build success: 45a25997cca5 (python:2.7.7)
2014-06-23 21:55:07,427 INFO Build success: 45a25997cca5 (python:2.7)
2014-06-23 21:55:07,432 INFO Build success: 45a25997cca5 (python:2)
```