Taking a stab at adding logger and middleware

Taking a stab at adding a logger object and middleware to make messina SUPER DUPER CONVENIENT for all our projects. Additional notes inline.

Basic usage is:

```javascript
var messina = require('messina');
var log = messina('MyAppName');

log.init(); // starts redirecting console to STDERR

app.use(log.middleware()); // for express logging
```