Add dev-setup-env and dev-start-server scripts

These make it easier to spin up a dev environment.

```
$ ./dev-setup-env
CREATE EXTENSION
CREATE EXTENSION
...
[2014-12-09 14:39:55 INFO] Running upgrade 4c8b2dd27587 -> 8f38eea7678, Remove the download statistics
[2014-12-09 14:39:55 DEBUG] update 4c8b2dd27587 to 8f38eea7678
[2014-12-09 14:39:55 INFO] Running upgrade 8f38eea7678 -> 416778ef37b, add id index to journals
[2014-12-09 14:39:55 DEBUG] update 8f38eea7678 to 416778ef37b

$ ./dev-start-server
...
[2014-12-09 15:49:53 INFO]  * Running on http://localhost:9000/
[2014-12-09 15:49:53 INFO]  * Restarting with reloader
...
```