Gabe dockerfile

This creates the basic docker image for collins. It uses H2 and is configured with a lot of development configs to enable quick testing. Downstream users will be able to vendorize the build by ADDing their own configs in /opt/collins/conf/.

Note, this depends on the changes in https://github.com/tumblr/collins/pull/207 to make collins run in the container when invoked as user, not root.

When we push this, it should be as simple as:
```
$ docker run -p9000:9000 --name collins tumblr/collins
Starting collins... [  OK  ]
2014-09-05 20:42:51,484 - [INFO] - from play in main database [collins] connected at jdbc:h2:mem:play
2014-09-05 20:43:03,616 - [WARN] - from org.apache.solr.core.SolrCore in main [] Solr index directory 'conf/solr/./data/index' doesn't exist. Creating new index...
2014-09-05 20:43:04,920 - [DEBUG] - from application in main Booting embedded Solr Server with solrhome conf/solr/
2014-09-05 20:43:05,333 - [INFO] - from play in main Starting application default Akka system.
2014-09-05 20:43:05,512 - [INFO] - from play in main Application started (Prod)
2014-09-05 20:43:05,708 - [INFO] - from akka.event.slf4j.Slf4jEventHandler in play-akka.actor.default-dispatcher-3 Slf4jEventHandler started
2014-09-05 20:43:06,043 - [INFO] - from play in main Listening for HTTP on port 9000...
^Z
$ bg %1
$ ./scripts/populate.sh
ASSET
        ID      2
        CREATED 2014-09-05T20:23:12
        TAG     tumblrtag300
        STATUS  Incomplete
        DELETED null
        UPDATED null
        STATE   null
        TYPE    SERVER_NODE
IPMI
        IPMI_USERNAME   root
        ID      2
        IPMI_ADDRESS    172.16.32.20
        IPMI_NETMASK    255.255.240.0
        ASSET_ID        2
        ASSET_TAG       tumblrtag300
        IPMI_GATEWAY    172.16.32.1
        IPMI_PASSWORD   FG1hrav6MjXVPsHY
SUCCESS true
....
```

cc @maddalab @dallasmarlow @Primer42 @roymarantz