Add java image

```console
root@e38bd9bb6758:/stackbrew/stackbrew# ./brew-cli --debug -b java --targets java git://github.com/infosiftr/stackbrew
2014-06-05 22:35:31,000 DEBUG Cloning repo_url=git://github.com/infosiftr/stackbrew, ref=java
2014-06-05 22:35:31,002 DEBUG folder = /tmp/tmpxTEoDf
2014-06-05 22:35:31,002 DEBUG Cloning git://github.com/infosiftr/stackbrew into /tmp/tmpxTEoDf
2014-06-05 22:35:31,002 DEBUG Executing "git clone git://github.com/infosiftr/stackbrew ." in /tmp/tmpxTEoDf
Cloning into '.'...
remote: Counting objects: 751, done.
remote: Compressing objects: 100% (397/397), done.
remote: Total 751 (delta 411), reused 643 (delta 343)
Receiving objects: 100% (751/751), 113.21 KiB | 0 bytes/s, done.
Resolving deltas: 100% (411/411), done.
Checking connectivity... done.
2014-06-05 22:35:31,863 DEBUG Checkout ref:java in /tmp/tmpxTEoDf
2014-06-05 22:35:31,863 DEBUG Executing "git checkout java" in /tmp/tmpxTEoDf
Branch java set up to track remote branch java from origin.
Switched to a new branch 'java'
2014-06-05 22:35:31,869 DEBUG latest: git://github.com/docker-library/docker-java@1ffa4d8285908a0524d4031315781c95025654b7

2014-06-05 22:35:31,869 DEBUG 7: git://github.com/docker-library/docker-java@1ffa4d8285908a0524d4031315781c95025654b7

2014-06-05 22:35:31,869 DEBUG java: latest,7
2014-06-05 22:35:31,869 DEBUG Cloning repo_url=git://github.com/docker-library/docker-java, ref=1ffa4d8285908a0524d4031315781c95025654b7
2014-06-05 22:35:31,869 DEBUG folder = /tmp/tmplhda_f
2014-06-05 22:35:31,869 DEBUG Cloning git://github.com/docker-library/docker-java into /tmp/tmplhda_f
2014-06-05 22:35:31,870 DEBUG Executing "git clone git://github.com/docker-library/docker-java ." in /tmp/tmplhda_f
Cloning into '.'...
remote: Counting objects: 3, done.
remote: Compressing objects: 100% (2/2), done.
remote: Total 3 (delta 0), reused 3 (delta 0)
Receiving objects: 100% (3/3), done.
Checking connectivity... done.
2014-06-05 22:35:32,315 DEBUG Checkout ref:1ffa4d8285908a0524d4031315781c95025654b7 in /tmp/tmplhda_f
2014-06-05 22:35:32,315 DEBUG Executing "git checkout 1ffa4d8285908a0524d4031315781c95025654b7" in /tmp/tmplhda_f
Note: checking out '1ffa4d8285908a0524d4031315781c95025654b7'.

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 1ffa4d8... Add initial Dockerfile
2014-06-05 22:35:32,319 INFO Build start: java ('git://github.com/docker-library/docker-java', '1ffa4d8285908a0524d4031315781c95025654b7', '.')
2014-06-05 22:35:32,659 INFO Build success: c916189b540c (java:latest)
2014-06-05 22:35:32,663 INFO Build success: c916189b540c (java:7)
```