Fabric code for deploying the site to a vagrant box

These changes allow you to run a command to deploy the bugtracker site to a vagrant box. We can walk through the code.

Hopefully you could clone this branch, run `vagrant up` and then run `fab vagrant provision` and then `fab vagrant deploy`. After that hopefully you'd be able to point your browser to 127.0.0.1:8080 to see your site.




Here's some explanation for why I make a database with the same name as the user that the bugtracker app is running from.  Postgres allows a configuration where it allows authentication without a password if the connection is happening on the same machine and the user is connecting to a database owned by a role with the same name as the user.

for nitty gritty details see

http://www.postgresql.org/docs/9.1/static/auth-pg-hba-conf.html

```
# TYPE  DATABASE        USER            ADDRESS                 METHOD
local   sameuser        all                                     md5
```